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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Brigand Arms HOPLITE Picatinny Rail SectionSpecial Price $15.92 Regular Price $26.10
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Andro Corp Industries Low Profile Gas Block - .750Special Price $15.92 Regular Price $25.50
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Tactical Edge Arms MOD 0 AR-15 Complete Lower Receiver - No StockSpecial Price $249.92 Regular Price $349.99
Shop By
Shopping Options
Barrel Length
- 3.1" 1 item
- 3.66" 1 item
- 4" 4 items
- 4.5" 3 items
- 5" 2 items
- 5.25" 1 item
- 5.5" 16 items
- 6" 7 items
- 6.5" 3 items
- 6.75" 1 item
- 7" 4 items
- 7.25" 1 item
- 7.5" 11 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" 2 items
- 10.3" 15 items
- 10.5" 42 items
- 10.7" 4 items
- 11" 1 item
- 11.5" 19 items
- 11.85" 2 items
- 12" 7 items
- 12.3" 1 item
- 12.5" 19 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 9 items
- 13.9" 7 items
- 14.5" 35 items
- 16" 122 items
- 16" Dissipator 1 item
- 16.1" 4 items
- 16.3" 2 items
- 17" 1 item
- 18" 63 items
- 20" 26 items
- 20.5" 1 item
- 22" 16 items
- 24" 7 items
- 26" 3 items
Barrel Profile
Caliber
- .22 ARC 2 items
- .22 Cal 2 items
- .22 LR 4 items
- .223/5.56 24 items
- .223 Rem 1 item
- .223 Wylde 23 items
- .30-30 1 item
- .30 Cal 13 items
- .308 20 items
- .308 Win 15 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 43 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 13 items
- 5.56 NATO 133 items
- 5.56mm 13 items
- 6mm ARC 10 items
- 6.5 Creedmoor 22 items
- 6.5 Grendel 11 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 7 items
- 7.62mm 7 items
- 7.62x39 12 items
- 7.62x51 7 items
- 8.6 Blackout 6 items
- 9mm 76 items
Category
- Receiver Parts 360 items
- Parts & Kits 294 items
- Rifle Barrels 216 items
- Buffer Systems 74 items
- Trigger Parts 172 items
- Gas Systems 71 items
- Muzzle Devices 254 items
- Bolt Parts 108 items
- Grips 169 items
- Charging Handles 96 items
- Rifle Handguards 220 items
- Stocks & Braces 180 items
- MILSPEC Parts 45 items
Configuration
- 90 Degree 1 item
- AR-10 5 items
- AR-15 33 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 13 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 10 items
- .750 DIA 31 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
- Silent Captured Spring Heavy 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 5 items
- Bead Blast Stainless Steel 1 item
- Black 27 items
- Black Nitride 4 items
- Blue 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 39 items
- Nitromet 7 items
- Phosphate 8 items
- Polished 1 item
- Red 4 items
- Satin 3 items
- Anodize 70 items
- Clear Hard Anodize 4 items
- PVD/CVD 2 items
- Quench Polish Quench (QPQ) 9 items
- Titanium Nitride (TiN) 2 items
Gas Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 37 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 4 items
- Aero Precision 67 items
- Aeroknox 8 items
- Agency Arms 1 item
- Airborne Arms 4 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 12 items
- Arms Republic 13 items
- Ascalon Arms 11 items
- Brügger & Thomet (B&T) 2 items
- B5 Systems 9 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 5 items
- Boss Barrels 8 items
- Bravo Company MFG (BCM) 81 items
- Breek Arms 3 items
- Brigand Arms 2 items
- Centurion Arms 15 items
- Chisel Machining 5 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- CMMG 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 17 items
- Daniel Defense 20 items
- Dead Air Armament 7 items
- Dead Foot Arms LLC 12 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 8 items
- Driven Arms Co. 12 items
- Elftmann Tactical 6 items
- Emissary Development 6 items
- Ergo Grips 8 items
- F-1 Firearms 4 items
- F5 MFG 13 items
- Faxon Firearms 66 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 60 items
- Forward Controls Design 90 items
- FosTecH 3 items
- Foxtrot Mike 2 items
- Gear Head Works 4 items
- Geissele 39 items
- Grand Power 2 items
- Grey Birch MFG 7 items
- Grey Ghost Precision 2 items
- Griffin Armament 29 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 24 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 15 items
- JL Billet 5 items
- JMAC Customs 67 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
- 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) 26 items
- LUTH-AR 3 items
- Mad Pig 6 items
- Mag-Pod 1 item
- Magpul Industries 77 items
- Matador Arms 1 item
- Maxim Defense 31 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 23 items
- NIGHT FISION 1 item
- Noveske 57 items
- Obsidian Arms 1 item
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 8 items
- Precision Armament 17 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 19 items
- Q, LLC 13 items
- Quarter Circle 10 9 items
- R&D Precision 4 items
- Radian Weapons 17 items
- Raidworx 1 item
- Rainier Arms, LLC 127 items
- Rainier Industries 16 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 19 items
- RogueOps 3 items
- RS Regulate 6 items
- Rubber City Armory 1 item
- SB Tactical 9 items
- SCALARWORKS 1 item
- Seekins Precision 4 items
- Sharps Bros 29 items
- Shooting Innovations 1 item
- Sig Sauer 10 items
- Silencerco 14 items
- Sionics Weapon Systems 6 items
- SLR Rifleworks 7 items
- Sons of Liberty Gun Works 41 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 18 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 68 items
- VKTR Industries 3 items
- VLTOR 16 items
- White Label Armory 2 items
- WMD Guns 17 items
- WOOX 6 items
- ZEV Technologies 1 item
Model
Option
- AK-47/74 13 items
- AR-9 12 items
- AR-10 53 items
- AR-15 304 items
- FN 509 1 item
- Standard 4 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 4 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 3 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
Price
Product Type
- 80% Lower 2 items
- 10/22 Receiver 1 item
- Accessory 4 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 26 items
- Anti Walk Pins 5 items
- AR-10 / LR 308 Charging Handle 9 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 4 items
- AR-10 Stripped Upper Receiver 4 items
- AR-15 Assembled Upper Receiver 7 items
- AR-15 Charging Handle 43 items
- AR-15 Complete Lower Receiver 30 items
- AR-15 Complete Upper Receiver 55 items
- AR-15 Partial Upper Receiver 48 items
- AR-15 Handguard 85 items
- AR-15 Receiver Set 24 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 57 items
- AR-15 Stripped Upper Receiver 43 items
- 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 9 items
- Barrel 215 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 5 items
- Bolt 14 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 70 items
- Bolt Catch 25 items
- Brace 27 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 47 items
- Chassis 26 items
- Cheek Riser 4 items
- Compensator 51 items
- Complete Upper 18 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 68 items
- Forearm Accesory 22 items
- Forward Assist 12 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 53 items
- Gas Rings 3 items
- Gas Tube 6 items
- Grip Accessory 12 items
- Grip Module 2 items
- Grip Screw 1 item
- Gunsmithing Tool 1 item
- Handguard 77 items
- Handguard Adaptor 2 items
- Handgun 1 item
- Handstop 42 items
- Iron Sight 2 items
- Key Screw 1 item
- Lower Parts Kit 26 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 109 items
- Muzzle Device Accessory 18 items
- Parts Kit 16 items
- Patch 1 item
- Pistol Grip 63 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 9 items
- Rail Cover 2 items
- Rail Panel 16 items
- Rail Section 3 items
- Recoil Spring 2 items
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 52 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 19 items
- Stock Adapter 30 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 23 items
- Trigger 142 items
- Trigger / Hammer Pins 4 items
- Trigger Guard 17 items
- Trigger Spring 1 item
- Upper Parts Kit 3 items
- Vertical Grip 26 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" 1 item
- 8" 6 items
- 8.25" 1 item
- 8.5" 2 items
- 8.6" 1 item
- 9" 13 items
- 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" 17 items
- 13.25" 2 items
- 13.5" 14 items
- 13.6" 4 items
- 13.625" 2 items
- 13.7" 10 items
- 13.75" 1 item
- 13.8" 7 items
- 14" 10 items
- 14.3" 1 item
- 15" 64 items
- 15.25" 1 item
- 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 3 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 7 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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