Parts
Our amazing offer consists of a great variety of AR-10, AR-15, and pistol parts and accessories. Purchase upper receivers, muzzle devices, handguards, BCG, barrels, triggers, magazine extensions, etc., and start modifying your firearm today.
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Firearm parts
Rainier Arms is the best place to purchase parts and accessories for your rifle or pistol online, and all that for more than affordable prices. Look no further, you can find here everything that comes to your mind and more! The best manufacturers in the business, like Killer Innovations, Lantac, Next Level Armament, Rainier Arms LLC, Apex Tactical Specialties, and many more are here to offer you their high-quality products. Select your preferred part and make your AR-10, AR-15 or pistol a unique piece of firearm.
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Shopping Options
Price
Color
- Aluminum 6 items
- Barrett Brown 4 items
- Battle Worn Bronze 1 item
- Battleworn Red 1 item
- Black 269 items
- Black Diamond 1 item
- Black DLC 4 items
- Black Nitride 18 items
- Black/Black 13 items
- Black/Gray 6 items
- Black/Gold 1 item
- Black/Red 8 items
- Blue 22 items
- Blue/Black 6 items
- Bronze 3 items
- Burnt Bronze 4 items
- Chameleon PVD 4 items
- Clear 6 items
- Clear / Aluminum 1 item
- Cobalt 5 items
- Copper 7 items
- Coyote 1 item
- Coyote Brown 2 items
- Crushed Orchid 1 item
- DLC 17 items
- Flat Dark Earth 62 items
- FDE/Black 6 items
- FDE/FDE 1 item
- Foliage Green 1 item
- Gold 62 items
- Gold/Black 8 items
- Gray 38 items
- Gray/Black 7 items
- Grey/Gold 1 item
- Gray/Red 1 item
- Grey 30 items
- Grey/Black 1 item
- Green 1 item
- Gold TiN 14 items
- Gold/Gold 1 item
- Gunmetal Gray Shoe/Black Safety 1 item
- Ion Bond Black 1 item
- MDC Gray 3 items
- Nickel 1 item
- Nitride 3 items
- OD Green 15 items
- Orange 13 items
- Orange/Black 10 items
- Orange/White 5 items
- Red/Gold 1 item
- Raw 6 items
- Raw Satin Titanium 1 item
- Red 83 items
- Red/Black 9 items
- Rose TiCN 2 items
- Scorched Dark Earth 1 item
- Silver 13 items
- Sniper Grey 4 items
- Spectrum 7 items
- Stainless 5 items
- Stainless Steel 19 items
- Stealth Gray 5 items
- Stealth Grey 3 items
- Tan 21 items
- Titan 3 items
- Tungsten 8 items
- White 6 items
- White/Black 4 items
- White/Blank 1 item
- White/White 1 item
- Yellow 9 items
- Yellow/Black 4 items
Product Type
- 80% Lower 12 items
- Adapter Plate 3 items
- Ammunition 1 item
- Angled Grip 1 item
- AR-10 / LR 308 Charging Handle 1 item
- AR-10 Complete Upper Receiver 1 item
- AR-10 Partial Upper Receiver 1 item
- AR-10 Handguard 2 items
- AR-10 Receiver Set 2 items
- AR-10 Rifle 3 items
- AR-10 Stripped Upper Receiver 1 item
- AR-10 Upper Receiver Group 1 item
- AR-15 Assembled Upper Receiver 1 item
- AR-15 Charging Handle 1 item
- AR-15 Complete Lower Receiver 3 items
- AR-15 Complete Upper Receiver 6 items
- AR-15 Handguard 14 items
- AR-15 Receiver Set 4 items
- AR-15 Stripped Lower Receiver 8 items
- AR-15 Stripped Upper Receiver 5 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Lower Receiver 2 items
- AR-9 Receiver Set 1 item
- AR-9 Upper Receiver 1 item
- Backplate 1 item
- Barrel 240 items
- Basepad 7 items
- Bipod Adapater 2 items
- Bipod Mount 1 item
- Bolt Carrier Group 12 items
- Brace 1 item
- Buffer 3 items
- Buffer Spring 1 item
- Castle Nut 1 item
- Charging Handle 7 items
- Cleaning Supplies 6 items
- Compensator 44 items
- Dust Cover 2 items
- End Plate 1 item
- Extended Slide Stop 2 items
- Firearm 1 item
- Fire Control Unit 2 items
- Firing Pin 3 items
- Flash Hider 3 items
- Flashlight 1 item
- Forward Assist 1 item
- Gas Block 2 items
- Grip Accessory 2 items
- Grip Module 47 items
- Guide Rod 30 items
- Gunsmithing Tool 1 item
- Handguard 3 items
- Handgun 2 items
- Handgun Sights 23 items
- Handstop 1 item
- Holster 17 items
- Iron Sight 3 items
- Laser 2 items
- Locking Block 2 items
- Lower Parts Kit 7 items
- Magazine 26 items
- Magazine Accessory 2 items
- Magazine Catch 2 items
- Magazine Extension 13 items
- Magazine Release 14 items
- Magnifier 1 item
- Magwell 40 items
- Muzzle Brake 4 items
- Optic Accessory 2 items
- Optic Mount 3 items
- Optic Plate 5 items
- Parts Kit 3 items
- Pistol Accessory 21 items
- Pistol Backstrap 1 item
- Pistol Frame 35 items
- Pistol Grip 11 items
- Pistol Part 47 items
- Pistol Sights 21 items
- Port Door Rod 1 item
- Rail Adapter 3 items
- Recoil Spring 5 items
- Red Dot Mount 3 items
- Red Dot Sight 1 item
- Rifle Scope 4 items
- Safety Selector 4 items
- Shim Set 1 item
- Short-Barrel Rifle 1 item
- Sight Post 3 items
- Slide 110 items
- Slide Parts kit 9 items
- Slide Plate 7 items
- Spring 7 items
- Stabilizer Kit 19 items
- Stock 6 items
- Suppressor 1 item
- Take Down / Pivot Pins 1 item
- Trigger 117 items
- Trigger Guard 1 item
- Vertical Grip 4 items
Caliber
Finish
- Alpine Multicam 1 item
- Aluminum 2 items
- Battleworn 2 items
- Black 69 items
- Black Anodize 1 item
- Black/Black 7 items
- Black DLC 28 items
- Black Nitride 10 items
- Black/Nickel 6 items
- Black Nickel Teflon 1 item
- Black Oxide 1 item
- Black/TiN 7 items
- Blue 8 items
- Bronze 26 items
- Burnt Bronze 1 item
- Cerakote 1 item
- Chameleon 13 items
- Copper 8 items
- Cobalt Grey 3 items
- Clear 10 items
- DLC 40 items
- FDE 7 items
- FDE DLC 1 item
- Glock FDE 2 items
- Gold 18 items
- Gold Anodize 1 item
- Gold TiN 2 items
- Gray 7 items
- Grey 11 items
- Grey/Black Camo 1 item
- Grey/Black Digital Camo 1 item
- Grey DLC 2 items
- MDC (Gray) 15 items
- Melonite 4 items
- Metallic Gray 1 item
- NeoChromatic 1 item
- Nickel Boron 2 items
- Nitride 10 items
- Orange 3 items
- OD Green 2 items
- Phosphate 1 item
- Polished 4 items
- Raw 3 items
- Red 11 items
- Rose 4 items
- Rose Gold TiCN 2 items
- Satin 17 items
- Sig Grey 2 items
- Spectrum 9 items
- Stainless Steel 63 items
- Stealth Grey 11 items
- TiN (Gold) 55 items
- Titan 1 item
- Titanium - Bead Blast 1 item
- Tungsten 2 items
- Two-Tone 1 item
- White 4 items
Barrel Length
- 3.1" 2 items
- 3.25" 1 item
- 3.41" 1 item
- 3.5" 1 item
- 3.6" 1 item
- 3.7" 1 item
- 3.86" 1 item
- 3.9" 16 items
- 4" 5 items
- 4.02" 2 items
- 4.49" 1 item
- 4.5" 3 items
- 4.57" 1 item
- 4.6" 1 item
- 4.7" 2 items
- 5" 1 item
- 5.2" 1 item
- 5.31" 1 item
- 5.5" 1 item
- 6" 1 item
- 7" 1 item
- 7.5" 2 items
- 8.5" 2 items
- 10.3" 4 items
- 10.5" 5 items
- 11.5" 1 item
- 12.75" 1 item
- 14.5" 2 items
- 16" 34 items
- 16.5" 3 items
- 18" 27 items
- 20" 3 items
- 22" 6 items
- 26" 4 items
Gas Length
Size
Rail Length
Configuration
- 1st - 3rd Gen 2 items
- 9mm, .40, .357 1 item
- AR-10 1 item
- AR-15 17 items
- Curve 2 items
- Curved 10 items
- Flat 8 items
- Gen 1-3 1 item
- Gen 3 17 items
- Gen 3 Glock 17/19/34 1 item
- Gen 4 17 items
- GEN 4/5 3 items
- Gen 5 4 items
- Glock .40 Cal Gen1-3 1 item
- Glock .40 cal Gen4 1 item
- Glock 9mm Gen 1-3 1 item
- Glock 9mm Gen4 1 item
- Glock Gen 5 4 items
- Holosun 509T 1 item
- Large Backstrap 2 items
- M-LOK 16 items
- Med Backstrap 2 items
- No Backstrap 2 items
- Normal CQR 2 items
- PF940Cv1 Textured Grip 1 item
- Quantity 50 1 item
- Right Hand 1 item
- SRS-H3 5.6oz 1 item
- Standard 1 item
- Straight 6 items
- Textured Grip 1 item
- W/O Mount 1 item
- With Mount 1 item
- SRS-C 3.3oz 1 item
- SRS-H 3.8oz 1 item
- SRS-H2 4.7oz 1 item
- SRS-9.5 5.4oz 1 item
- .625 DIA 2 items
- .750 DIA 13 items
- .875 DIA 2 items
- .936 DIA 1 item
- G17 18 items
- G19 30 items
- G21SF 1 item
- G22 1 item
- G26 6 items
- G34 1 item
- G42 1 item
- G43 11 items
- P320 6 items
- P365 2 items
- Enhanced Finger Placement (EFP) 1 item
Option
- AR-9 2 items
- AR-10 19 items
- AR-15 87 items
- RMR Cut 5 items
- Standard 1 item
- 6lb 2 items
- 6.5lb 2 items
- 4lb 2 items
- Multi Cut 4 items
- PCH Buffer 2 items
- 9mm Buffer 2 items
- H Buffer 2 items
- H1 Buffer 2 items
- H2 Buffer 2 items
- V1 9 items
- V2 10 items
- V3 6 items
- V4 6 items
- SRS-9mm 6.4 oz. 1 item
- SRS-308 1 item
- SRS-H3 5.6 oz. 1 item
- SRS-C 3.3 oz. 1 item
- SRS-H 3.8 oz. 1 item
- SRS-H2 4.7 oz. 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 1 item
- Buffer & Spring - H1 1 item
- Ultra Light 1 item
- Manual Safety 3 items
- No Safety 3 items
- (Green) - 13 lbs 2 items
- (Blue) - 15 lbs 2 items
- (Red) - 18 lbs 2 items
- CZ 27 items
- FNH 10 items
- Glock 513 items
- Heckler & Koch 4 items
- Sig Sauer 145 items
- Smith & Wesson 35 items
- Springfield 13 items
- Walther 3 items
Manufacturer
- 10-8 Performance 10 items
- Aeroknox 1 item
- Agency Arms 76 items
- Aimpoint 1 item
- Align Tactical 1 item
- ALG Defense 2 items
- Amend2 2 items
- American Trigger Company (ATC) 1 item
- Angstadt Arms 6 items
- ANR Design 5 items
- Apex Tactical Specialties 53 items
- ARC Division 9 items
- Armaspec 8 items
- Arms Republic 7 items
- Arsenal Firearms 2 items
- Ascalon Arms 1 item
- Brügger & Thomet (B&T) 1 item
- B5 Systems 2 items
- Ballistic Advantage 10 items
- Battle Arms Development 11 items
- Blitzkrieg Components 1 item
- Bootleg 1 item
- CAA 17 items
- CMC Triggers 11 items
- CR Precision 2 items
- Cross Machine Tool (CMT) 6 items
- Danger Close Armament 33 items
- Dark Hour Defense 6 items
- Devil Dog Concepts 3 items
- Dewey Rods 2 items
- DK Custom Coatings 6 items
- DPM Systems Technologies 18 items
- Elite Tactical Systems (ETS) 1 item
- Elzetta Design LLC 2 items
- Faction 8 items
- Faxon Firearms 36 items
- Fortis MFG 6 items
- Forward Controls Design 2 items
- Gill Firearms 1 item
- Glock 3 items
- GoGun USA 4 items
- Grayguns 33 items
- Grey Ghost Precision 39 items
- Griffin Armament 14 items
- Gun Point 1 item
- Gun Pro 5 items
- Guncrafter Industries 2 items
- Gunfighters Inc 1 item
- HB Industries 1 item
- Heavy Buffer 1 item
- Heckler & Koch 4 items
- HERA ARMS 18 items
- Hexmag 3 items
- Hiperfire 11 items
- Icarus Precision 10 items
- Inforce 2 items
- Iron City Rifle Works 14 items
- IWI 4 items
- James Madison Tactical (JMT) 2 items
- JL Billet 2 items
- JMAC Customs 4 items
- JP Enterprises Inc 20 items
- Kagwerks 2 items
- Killer Innovations 48 items
- Kinetic Development Group 2 items
- KNS Precision 4 items
- Kriss USA 6 items
- K Rounds LLC 11 items
- L2D Combat 29 items
- Lancer Systems 4 items
- Lantac 23 items
- LAS Concealment 1 item
- Legion Precision 2 items
- Lone Wolf Arms 1 item
- LUTH-AR 1 item
- LWRC International 1 item
- Magpul Industries 9 items
- Master Of Arms 2 items
- Maxim Defense 2 items
- MBX Extreme 2 items
- Mega Arms 3 items
- Mil-Comm 8 items
- Mission First Tactical 4 items
- Modular Evolution LLC 1 item
- Mirzon 7 items
- Mid-Evil 4 items
- MVB Industries 4 items
- Next Level Armament 15 items
- NIGHT FISION 33 items
- Nighthawk Custom 6 items
- Nomad Defense 7 items
- NEMO Arms 1 item
- Norsso 22 items
- Noveske 9 items
- Odin Works 23 items
- Otis Technologies 1 item
- Overwatch Precision 11 items
- Okay Industries 4 items
- Patriot Ordnance Factory (POF) 6 items
- Phase 5 Tactical 3 items
- Pioneer CNC 2 items
- Polymer80 23 items
- Precision Armament 1 item
- Primary Arms 4 items
- Primary Weapon Systems 5 items
- Proof Research 1 item
- Quarter Circle 10 1 item
- Radian Weapons 1 item
- Rainier Arms, LLC 85 items
- Rainier Munitions 1 item
- Recover Tactical 12 items
- Reptilia Corp 1 item
- Ruger 1 item
- Rugged Suppressor 1 item
- SB Tactical 1 item
- SCALARWORKS 2 items
- Seekins Precision 2 items
- Sharps Bros 1 item
- Shooting Innovations 1 item
- Sig Sauer 22 items
- Silencerco 3 items
- SLR Rifleworks 4 items
- Smith & Wesson 1 item
- Springer Precision 16 items
- Stag Arms 3 items
- Stern Defense 1 item
- Strike Industries 51 items
- Surefire 3 items
- Shield Arms 1 item
- Sionics Weapon Systems 2 items
- Smartmag 1 item
- Sprinco (Tactical Springs) 9 items
- STI International 1 item
- Stoeger 1 item
- Tactical Edge Arms 4 items
- Tactical Link 3 items
- Tactical Solutions 8 items
- Taylor Freelance 6 items
- Timney Triggers 11 items
- TorkMag 1 item
- Triggertech 4 items
- Trijicon 15 items
- Trinity Nevada 4 items
- True Precision 38 items
- TXC Holsters 5 items
- Tyrant Designs 50 items
- Umbrella Corporation 2 items
- Underground Tactical 1 item
- V Seven Weapon Systems 3 items
- Venom Defense 2 items
- VG6 Precision 1 item
- VLTOR 1 item
- Vortex Optics 4 items
- Wilson Combat 7 items
- White Label Armory 1 item
- WMD Guns 3 items
- Yankee Hill Machine 1 item
- Young MFG 1 item
- ZEV Technologies 82 items
What are the most common barrel thread patterns for pistols and rifles?
For .22LR, .22MAG, .17HMR, 9mm, and .223/5.56 NATO the most common thread pattern would be 1/2x28, with some exceptions for 9mm and .223/5.56 NATO firearms. As for .308/7.62mm and .338 Lapua Magnum, the thread pattern that is most commonly used is 5/8x24, with a few exceptions. Another typical thread pattern is 9/16x24 and it is mostly used for .40 S&W weapons.
Single triggers or two-stage triggers?
Whichever you choose, you cannot go wrong. The single trigger is fast and simple to use; as soon as you apply a small amount of pressure, the firearm goes off. Two-stage trigger is extremely accurate and you know precisely when the shot is going to be fired. The first stage prepares you for the second one, when the trigger pushes the hammer up causing the firearm to discharge. So, it is up to you to make a choice.