Rifle Parts
Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more.
Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.
Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.
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Shopping Options
Barrel Length
- 3.1" 1 item
- 3.66" 1 item
- 4" 5 items
- 4.5" 3 items
- 5" 5 items
- 5.25" 1 item
- 5.5" 15 items
- 6" 9 items
- 6.5" 3 items
- 6.75" 1 item
- 7" 4 items
- 7.25" 1 item
- 7.5" 10 items
- 7.75" 2 items
- 7.94" 1 item
- 8" 13 items
- 8.3" 4 items
- 8.5" 14 items
- 8.75" 1 item
- 9" 5 items
- 9.5" 1 item
- 9.75" 1 item
- 10" 3 items
- 10.3" 17 items
- 10.5" 41 items
- 10.7" 5 items
- 11" 1 item
- 11.5" 19 items
- 11.85" 2 items
- 12" 7 items
- 12.3" 1 item
- 12.5" 22 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 8 items
- 13.9" 6 items
- 14.5" 35 items
- 16" 132 items
- 16.1" 4 items
- 16.3" 2 items
- 17" 1 item
- 18" 83 items
- 20" 35 items
- 20.5" 1 item
- 22" 29 items
- 24" 8 items
- 26" 4 items
Barrel Profile
Caliber
- .22 ARC 4 items
- .22 Cal 2 items
- .22 LR 4 items
- .223/5.56 23 items
- .223 Rem 1 item
- .223 Wylde 47 items
- .30-30 1 item
- .30 Cal 13 items
- .308 16 items
- .308 Win 41 items
- .338 1 item
- .357 Magnum 2 items
- .38/.357 Magnum 1 item
- .44/.45 2 items
- .45-70 GOVT 2 items
- .45 ACP 5 items
- .458 Socom 3 items
- 12 Gauge 1 item
- 300 Blackout 52 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 10 items
- 5.56 NATO 160 items
- 5.56mm 11 items
- 6mm ARC 17 items
- 6.5 Creedmoor 36 items
- 6.5 Grendel 17 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 17 items
- 7.62mm 7 items
- 7.62x39 12 items
- 7.62x51 11 items
- 8.6 Blackout 8 items
- 9mm 86 items
Category
- Receiver Parts 359 items
- Parts & Kits 298 items
- Barrels 233 items
- Rifle Barrels 130 items
- Buffer Systems 74 items
- Trigger Parts 175 items
- Gas Systems 72 items
- Muzzle Devices 252 items
- Bolt Parts 104 items
- Grips 183 items
- Charging Handles 93 items
- Rifle Handguards 221 items
- Stocks & Braces 183 items
- MILSPEC Parts 46 items
Configuration
- 90 Degree 1 item
- AR-10 4 items
- AR-15 31 items
- Carbine 1 item
- Clamp on Piston Block 1 item
- Cross 1 item
- Curved 25 items
- Flaming Pig 1 item
- Flat 27 items
- Gen 1-3 1 item
- Gen 3 2 items
- GEN 2 1 item
- Ghetto Blaster 1 item
- Left 1 item
- Left Hand 1 item
- M-LOK 12 items
- M4 Curve 1 item
- Mil-Spec 1 item
- Normal CQR 2 items
- Restricted CQR 2 items
- Rifle 3 items
- Right Hand 1 item
- Solid Piston Block 1 item
- Straight 8 items
- .625 DIA 9 items
- .750 DIA 30 items
- .800 DIA 2 items
- .875 DIA 5 items
- .936 DIA 6 items
- Standard Buffer and Spring 1 item
- Silent Captured Spring 9mm 1 item
- Enhanced Finger Placement (EFP) 1 item
- Type 1 Trunnion 1 item
- Type 2 Trunnion 1 item
- Large Latch 1 item
- Medium Latch 1 item
- Small Latch 1 item
- AK74 [WL 5.62"/143mm][HD .32"/8mm] 1 item
- AIMS-74 [WL 4.80"/122mm][HD .32"/8mm] 1 item
- AK-105 JBI Custom [WL 4.20"/107mm][HD .45"/11mm] 1 item
- AKM Large Bore [WL 5.83"/148mm][HD .31"/8mm] 1 item
- AMD65 [WL 4.67"/119mm][HD .31"/8mm] 1 item
- Arsenal Rifle Small Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
- Arsenal Rifle Large Bore [WL 5.75"/146mm][HD .30"/8mm] 1 item
- 5.45 Krinkov [WL 2.03"/52mm][HD .32"/8mm] 1 item
- 7.62 Krinkov [WL 2.22"/56mm][HD .31"/8mm] 1 item
- Bulgarian 5.45 Krinkov [WL 2.03"/52mm][HD .42"/11mm] 1 item
- Bulgarian AK74 [WL 5.62"/143mm][HD .42"/11mm] 1 item
- DRACO [WL 4.78"/121mm][HD .32"/8mm] 1 item
- Galil Ace [WL 2.15"/118mm][HD .32"/8mm] 1 item
- M85 [WL 4.41"/112mm][HD .31"/8mm] 1 item
- M92 2.218 [WL 3.90"/99mm][HD .30"/8mm] 1 item
- PSL [WL 3.90"/99mm][HD .30"/8mm] 1 item
- Valmet M76 / Galil Classic ARM [WL 4.20"/107mm][HD .45"/11mm] 1 item
- VEPR Small Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
- VEPR Big Bore [WL 5.62"/143mm][HD .32"/8mm] 1 item
- WZ89 Onyks [WL 2.15"/55mm][HD .32"/8mm] 1 item
- .478 +/- Bolt Face 1 item
Finish
- Arid 2 items
- Bead Blast 3 items
- Bead Blast Stainless Steel 1 item
- Black 26 items
- Black Nitride 4 items
- Blue 1 item
- Case Hardened 1 item
- Carbon Fiber 2 items
- Cerakote 7 items
- Chrome 1 item
- DLC 7 items
- FDE 5 items
- Gold 1 item
- Grey 1 item
- Melonite 3 items
- NiB-X 4 items
- Nickel Boron 9 items
- Nitride 92 items
- Nitromet 7 items
- Phosphate 8 items
- Polished 46 items
- Red 4 items
- Satin 81 items
- Anodize 68 items
- Clear Hard Anodize 4 items
- PVD/CVD 2 items
- Quench Polish Quench (QPQ) 9 items
- Titanium Nitride (TiN) 2 items
Gas System Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 42 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 4 items
- Aero Precision 66 items
- Aeroknox 8 items
- Agency Arms 1 item
- Airborne Arms 3 items
- ALG Defense 6 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 13 items
- Apex Tactical Specialties 5 items
- Arisaka 6 items
- Armaspec 11 items
- Arms Republic 13 items
- Ascalon Arms 11 items
- Brügger & Thomet (B&T) 3 items
- B5 Systems 10 items
- Ballistic Advantage 43 items
- Battle Arms Development 49 items
- Blackout Defense 9 items
- Black River MFG 1 item
- Blitzkrieg Components 17 items
- BOBRO 1 item
- Bootleg 4 items
- Boss Barrels 11 items
- Bravo Company MFG (BCM) 83 items
- Breek Arms 1 item
- Brigand Arms 2 items
- Centurion Arms 16 items
- Chisel Machining 5 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 16 items
- Daniel Defense 20 items
- Dead Air Armament 7 items
- Dead Foot Arms LLC 11 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 8 items
- Driven Arms Co. 14 items
- Elftmann Tactical 6 items
- Emissary Development 6 items
- Ergo Grips 8 items
- F-1 Firearms 3 items
- F5 MFG 13 items
- Faxon Firearms 70 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 61 items
- Forward Controls Design 92 items
- FosTecH 3 items
- Gear Head Works 5 items
- Geissele 39 items
- Grand Power 2 items
- Grey Birch MFG 7 items
- Grey Ghost Precision 2 items
- Griffin Armament 27 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 25 items
- HERA ARMS 20 items
- Heresy Design 8 items
- Hiperfire 25 items
- HUXWRX 6 items
- Icarus Precision 2 items
- Icon Defense 6 items
- Iron City Rifle Works 1 item
- Jacob Grey 2 items
- James Madison Tactical (JMT) 3 items
- JK Armament 16 items
- JL Billet 5 items
- JMAC Customs 73 items
- JP Enterprises Inc 39 items
- Killer Innovations 1 item
- Kinetic Development Group 9 items
- Knight’s Armament Company (KAC) 16 items
- KNS Precision 14 items
- Kalashnikov USA 2 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 8 items
- KynSHOT 6 items
- Lancer Systems 1 item
- Lantac 25 items
- Law Tactical 2 items
- Lee Sporting 4 items
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 32 items
- LUTH-AR 3 items
- Mad Pig 6 items
- Mag-Pod 1 item
- Magpul Industries 77 items
- Matador Arms 1 item
- Maxim Defense 32 items
- MCM Firearms 1 item
- Mega Arms 1 item
- Midwest Industries 32 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 8 items
- Neverwear Springs 1 item
- Next Level Armament 28 items
- NIGHT FISION 1 item
- Noveske 52 items
- Obsidian Arms 1 item
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 9 items
- Precision Armament 17 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 19 items
- Q, LLC 13 items
- Quarter Circle 10 8 items
- R&D Precision 4 items
- Radian Weapons 18 items
- Raidworx 1 item
- Rainier Arms, LLC 251 items
- Rainier Industries 17 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 20 items
- RogueOps 3 items
- RS Regulate 6 items
- Rubber City Armory 1 item
- SB Tactical 10 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 28 items
- Shooting Innovations 2 items
- Sig Sauer 10 items
- Silencerco 14 items
- Sionics Weapon Systems 6 items
- SLR Rifleworks 7 items
- Sons of Liberty Gun Works 47 items
- Spinta Precision 6 items
- Sprinco (Tactical Springs) 7 items
- Springer Precision 1 item
- Stag Arms 2 items
- Stern Defense 11 items
- Strike Industries 37 items
- Superlative Arms 14 items
- Surefire 12 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Taran Tactical Innovations 2 items
- Timney Triggers 32 items
- Tippmann Arms 1 item
- Triggertech 13 items
- Troy Industries 7 items
- TruCalibre 9 items
- True North Concepts 9 items
- Tyrant Designs 17 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 68 items
- VKTR Industries 5 items
- VLTOR 16 items
- White Label Armory 2 items
- WMD Guns 17 items
- WOOX 6 items
Model
Option
- AK-47/74 13 items
- AR-9 12 items
- AR-10 52 items
- AR-15 296 items
- FN 509 1 item
- Standard 3 items
- 4.720" 2 items
- 6.295" 2 items
- 7.870" 2 items
- 9.445" 2 items
- Bull's Eye 1 item
- Vertical Lines 1 item
- Minimal 1 item
- White - Standard Power 1 item
- Blue - Enhanced Power 1 item
- Red - Extra Power 1 item
- Orange - Extra Extra Power 1 item
- Yellow - Reduced Power 1 item
- White/Red - Intermediate Power 1 item
- Green - Rifle Length Standard Power 1 item
- SRS-C 3.3 oz. 1 item
- SRS-H 3.8 oz. 1 item
- SRS-H2 4.7 oz. 1 item
- SRS-H3 5.6 oz. 1 item
- SRS-BB 5.7 oz. 1 item
- SRS-9mm 6.4 oz. 1 item
- SRS-AR10 5.7 oz. 1 item
- Long 1 item
- Front 1 item
- Mid 1 item
- Rear 1 item
- Remington 700 Short Action 3 items
- Remington 700 Short Action BDL 2 items
- Remington 700 Long Action BDL 1 item
- Sauer 100 1 item
- WA 2 items
- KS 2 items
- JP Silent Captured Spring - Standard 1 item
- JP Silent Captured Spring - Heavy 1 item
- JP Silent Captured Spring - 9mm 1 item
- Buffer & Spring - Standard 3 items
- Buffer & Spring - 9mm 2 items
- Buffer & Spring - H1 3 items
- Buffer & Spring - H2 2 items
- Buffer & Spring - H3 2 items
- Mid Length 1 item
- 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
- 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
- 9mm 2 items
- CZ 29 items
- FNH 2 items
- Glock 3 items
- Heckler & Koch 2 items
- Remington 1 item
- Sharps Bros 1 item
- Sig Sauer 2 items
- Springfield 1 item
- Holed 1 item
- Profile 1 item
- Small Lever 3 items
- Large Lever 3 items
- AKM 1 item
- Green Laser 2 items
- Adjustable 14 items
- Non-Adjustable 37 items
- MCS 2 items
- Full Size 2 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 4 items
- Serrated 5 items
Platform
- 10-22 1 item
- AR-9 5 items
- AR-10/LR308 57 items
- AR-15 282 items
- AK47/74 16 items
- CZ-USA 27 items
- FNH 4 items
- H&K 3 items
- IWI 2 items
- Remington 4 items
- Remington 700 15 items
- Ruger 5 items
- Ruger Precision Rifle 12 items
- Savage Small Shank 15 items
- Sig Sauer 16 items
- Sig Cross 4 items
- Springfield 1 item
Price
Product Type
- 80% Lower 2 items
- 10/22 Receiver 1 item
- Accessory 6 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 25 items
- Anti Walk Pins 5 items
- AR-10/LR308 Barrel 41 items
- AR-10 / LR 308 Charging Handle 8 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Complete Upper Receiver 2 items
- AR-10 Partial Upper Receiver 3 items
- AR-10 Handguard 8 items
- AR-10 Receiver Set 6 items
- AR-10 Stripped Lower Receiver 5 items
- AR-10 Stripped Upper Receiver 4 items
- AR-15 Assembled Upper Receiver 7 items
- AR-15 Barrel 140 items
- AR-15 Charging Handle 43 items
- AR-15 Complete Lower Receiver 30 items
- AR-15 Complete Upper Receiver 53 items
- AR-15 Partial Upper Receiver 48 items
- AR-15 Handguard 85 items
- AR-15 Receiver Set 23 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 58 items
- AR-15 Stripped Upper Receiver 41 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Lower Receiver 4 items
- AR-9 Complete Lower Receiver 2 items
- AR-9 Partial Upper Receiver 1 item
- AR-9 Receiver Set 4 items
- AR-9 Upper Receiver 10 items
- Barrel 124 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 5 items
- Bolt 13 items
- Bolt-Action Barrel 52 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 69 items
- Bolt Catch 25 items
- Brace 28 items
- Brace Strap 1 item
- Buffer 34 items
- Buffer Kit 12 items
- Buffer Spring 13 items
- Buffer Tube 19 items
- Builders Kit 1 item
- Cam Pin 7 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 45 items
- Chassis 28 items
- Cheek Riser 4 items
- Compensator 50 items
- Complete Upper 17 items
- Crush Washer 3 items
- Dust Cover 15 items
- End Cap 9 items
- End Plate 14 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 6 items
- Flash Hider 66 items
- Forearm Accesory 21 items
- Forward Assist 12 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 54 items
- Gas Rings 3 items
- Gas Tube 6 items
- Grip Accessory 11 items
- Grip Module 2 items
- Grip Screw 1 item
- Gunsmithing Tool 1 item
- Handguard 77 items
- Handguard Adaptor 2 items
- Handgun 1 item
- Handstop 45 items
- Iron Sight 2 items
- Key Screw 1 item
- Lower Parts Kit 25 items
- Lower Receiver 5 items
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 11 items
- Magazine Release 23 items
- Magazine Spring 1 item
- Magwell 5 items
- Muzzle Brake 108 items
- Muzzle Device Accessory 20 items
- Parts Kit 17 items
- Patch 1 item
- Pistol Grip 69 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 8 items
- Port Door 5 items
- Port Door Rod 6 items
- Port Door Spring 1 item
- Rail Adapter 10 items
- Rail Cover 2 items
- Rail Panel 17 items
- Rail Section 3 items
- Recoil Spring 2 items
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 53 items
- Scope Mount 1 item
- Shim Set 5 items
- Sight Post 14 items
- Silent Captured Spring 2 items
- Sling Mount 2 items
- Spring 9 items
- Stock 94 items
- Stock Accessory 21 items
- Stock Adapter 30 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 24 items
- Trigger 145 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 17 items
- Trigger Spring 1 item
- Upper Parts Kit 3 items
- Vertical Grip 32 items
- Weight 1 item
Rail Length
- 3" 1 item
- 3.25" 1 item
- 4" 2 items
- 4.25" 4 items
- 4.5" 2 items
- 4.9" 1 item
- 5" 2 items
- 5.5" 2 items
- 5.99" 1 item
- 6.0" 7 items
- 6.25" 3 items
- 6.375" 1 item
- 6.5" 2 items
- 6.7" 8 items
- 6.75" 3 items
- 6.91" 1 item
- 7" 22 items
- 7.25" 3 items
- 7.3" 1 item
- 7.5" 2 items
- 7.8" 1 item
- 7.9" 2 items
- 8" 6 items
- 8.25" 1 item
- 8.5" 2 items
- 8.6" 1 item
- 9" 13 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 2 items
- 9.3" 2 items
- 9.5" 23 items
- 9.55" 7 items
- 9.59" 1 item
- 9.6" 7 items
- 9.75" 1 item
- 10" 32 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 16 items
- 10.64" 2 items
- 10.7" 4 items
- 10.75" 2 items
- 10.8" 1 item
- 11" 6 items
- 11.25" 1 item
- 11.5" 11 items
- 11.7" 4 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 33 items
- 12.25" 1 item
- 12.3" 1 item
- 12.4" 3 items
- 12.43" 1 item
- 12.5" 13 items
- 12.55" 1 item
- 12.6" 3 items
- 12.625" 1 item
- 12.75" 1 item
- 12.8" 1 item
- 13" 18 items
- 13.25" 2 items
- 13.5" 14 items
- 13.6" 4 items
- 13.625" 2 items
- 13.7" 9 items
- 13.75" 1 item
- 13.8" 7 items
- 14" 10 items
- 14.3" 1 item
- 15" 64 items
- 15.3" 7 items
- 15.5" 1 item
- 15.8" 1 item
- 16" 1 item
- 16.3" 1 item
- 16.5" 5 items
- 17" 3 items
- 18" 2 items
Size
- 3" 1 item
- 35mm rings 2 items
- BACK STRAP:Large 1 item
- BACK STRAP:Medium 2 items
- Small 1 item
- Medium 5 items
- Large 5 items
- X-Large 2 items
- 6" 1 item
- 3 Slot 3 items
- 5 Slot 6 items
- 7 Slot 2 items
- 9 Slot 29 items
- 1/2" 1 item
- 5/8" 1 item
- 1.9" 2 items
- 2.1" 2 items
- 3.3" 2 items
- 4.3" 2 items
- 4.8" 2 items
- 5.8" 2 items
Thread Pitch
Twist Rate
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