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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Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"5.0 star rating 2 Reviews$1,050.00Out of stock
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Cross Machine Tool (CMT) Tactical AR-15 UHPR MOD 2 HDX HANDGUARD5.0 star rating 1 ReviewOut of stock
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Shopping Options
Barrel Length
- 3.66" 1 item
- 5" 2 items
- 5.25" 1 item
- 5.5" 7 items
- 6" 2 items
- 6.5" 1 item
- 7" 1 item
- 7.25" 1 item
- 7.5" 2 items
- 7.94" 1 item
- 8" 6 items
- 8.3" 2 items
- 8.5" 6 items
- 9" 4 items
- 9.5" 1 item
- 10" 2 items
- 10.3" 3 items
- 10.5" 14 items
- 10.7" 2 items
- 11" 1 item
- 11.5" 9 items
- 11.85" 2 items
- 12" 6 items
- 12.5" 7 items
- 13" 1 item
- 13.7" 6 items
- 13.9" 1 item
- 14.5" 11 items
- 16" 47 items
- 16.1" 4 items
- 16.3" 1 item
- 18" 33 items
- 20" 17 items
- 22" 15 items
- 24" 2 items
Caliber
- .22 ARC 4 items
- .22 Cal 1 item
- .22 LR 1 item
- .223/5.56 7 items
- .223 Wylde 23 items
- .30-30 1 item
- .30 Cal 9 items
- .308 6 items
- .308 Win 18 items
- .338 1 item
- .357 Magnum 1 item
- .38/.357 Magnum 1 item
- .458 Socom 1 item
- 300 Blackout 31 items
- 5.56X45 5 items
- 5.56 NATO 83 items
- 5.56mm 3 items
- 6mm ARC 13 items
- 6.5 Creedmoor 8 items
- 6.5 Grendel 4 items
- 6MM Creedmoor 12 items
- 7.62mm 2 items
- 7.62x39 5 items
- 7.62x51 4 items
- 8.6 Blackout 4 items
- 9mm 32 items
Category
Configuration
- AR-10 2 items
- AR-15 8 items
- Carbine 1 item
- Curved 10 items
- Flat 11 items
- Left 1 item
- Left Hand 1 item
- M-LOK 5 items
- Rifle 1 item
- Straight 1 item
- .625 DIA 3 items
- .750 DIA 5 items
- .936 DIA 1 item
- Silent Captured Spring 9mm 1 item
- Large Latch 1 item
- Medium Latch 1 item
- Small Latch 1 item
- .478 +/- Bolt Face 1 item
Finish
- Arid 2 items
- Black 9 items
- Black Nitride 3 items
- Cerakote 7 items
- Chrome 1 item
- DLC 2 items
- FDE 1 item
- Melonite 2 items
- NiB-X 1 item
- Nickel Boron 5 items
- Nitride 42 items
- Nitromet 3 items
- Phosphate 2 items
- Polished 18 items
- Red 3 items
- Satin 38 items
- Anodize 36 items
- Clear Hard Anodize 4 items
- Quench Polish Quench (QPQ) 2 items
- Titanium Nitride (TiN) 2 items
Gas System Length
Inside Diameter
Manufacturer
- A3 Tactical 12 items
- Accu-Tac 1 item
- Advanced Armament Company (AAC) 1 item
- Aero Precision 60 items
- Aeroknox 6 items
- Agency Arms 1 item
- ALG Defense 1 item
- Angstadt Arms 9 items
- Arisaka 1 item
- Arms Republic 2 items
- Ascalon Arms 5 items
- Brügger & Thomet (B&T) 3 items
- B5 Systems 5 items
- Ballistic Advantage 26 items
- Battle Arms Development 36 items
- Blitzkrieg Components 4 items
- Bootleg 2 items
- Boss Barrels 1 item
- Bravo Company MFG (BCM) 39 items
- Centurion Arms 2 items
- Cross Machine Tool (CMT) 10 items
- Daniel Defense 3 items
- Dead Air Armament 3 items
- Dead Foot Arms LLC 5 items
- DPM Systems Technologies 3 items
- Drew Meyers Defense 2 items
- Driven Arms Co. 3 items
- Elftmann Tactical 3 items
- Emissary Development 1 item
- Ergo Grips 8 items
- F5 MFG 10 items
- Faxon Firearms 38 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Form Rifle 1 item
- Fortis MFG 18 items
- Forward Controls Design 10 items
- Gear Head Works 3 items
- Geissele 20 items
- Grey Birch MFG 6 items
- Griffin Armament 14 items
- HB Industries 20 items
- HERA ARMS 9 items
- Heresy Design 1 item
- Hiperfire 12 items
- HUXWRX 4 items
- Icon Defense 2 items
- JK Armament 9 items
- JMAC Customs 11 items
- JP Enterprises Inc 15 items
- Kinetic Development Group 5 items
- Knight’s Armament Company (KAC) 16 items
- KNS Precision 1 item
- Kalashnikov USA 2 items
- Kratos Design Group 2 items
- Krebs Customs 2 items
- KynSHOT 2 items
- Lantac 18 items
- Lee Sporting 4 items
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 12 items
- Mad Pig 2 items
- Mag-Pod 1 item
- Magpul Industries 21 items
- Maxim Defense 9 items
- Midwest Industries 21 items
- NEMO Arms 5 items
- Next Level Armament 12 items
- Noveske 32 items
- Patriot Ordnance Factory (POF) 3 items
- Precision Armament 8 items
- Primary Weapon Systems 12 items
- Q, LLC 11 items
- R&D Precision 2 items
- Radian Weapons 2 items
- Raidworx 1 item
- Rainier Arms, LLC 82 items
- Rainier Industries 2 items
- Rehv Arms 1 item
- Reptilia Corp 3 items
- Rise Armament 6 items
- RS Regulate 2 items
- Samson Manufacturing Corp. 1 item
- SB Tactical 2 items
- Sharps Bros 9 items
- Siege Suppressors 2 items
- Sig Sauer 7 items
- Silencerco 13 items
- Sionics Weapon Systems 5 items
- SLR Rifleworks 5 items
- Sons of Liberty Gun Works 11 items
- Spinta Precision 4 items
- Springer Precision 1 item
- Stag Arms 1 item
- Stern Defense 4 items
- Surefire 7 items
- Taran Tactical Innovations 2 items
- Timney Triggers 3 items
- Triggertech 8 items
- Troy Industries 7 items
- TruCalibre 6 items
- True North Concepts 1 item
- Tyrant Designs 6 items
- V Seven Weapon Systems 30 items
- VKTR Industries 5 items
- VLTOR 9 items
- White Label Armory 1 item
- WMD Guns 9 items
- WOOX 2 items
Model
Option
- AK-47/74 4 items
- AR-9 7 items
- AR-10 26 items
- AR-15 124 items
- FN 509 1 item
- Bull's Eye 1 item
- Vertical Lines 1 item
- Minimal 1 item
- Remington 700 Short Action 2 items
- Remington 700 Short Action BDL 1 item
- Remington 700 Long Action BDL 1 item
- Sauer 100 1 item
- WA 1 item
- KS 1 item
- 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
- 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
- 9mm 1 item
- CZ 15 items
- FNH 1 item
- Glock 3 items
- Heckler & Koch 1 item
- Small Lever 1 item
- Large Lever 2 items
- AKM 1 item
- Adjustable 3 items
- Non-Adjustable 15 items
- MCS 2 items
- Full Size 2 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 1 item
- Serrated 1 item
Platform
Price
Product Type
- 80% Lower 2 items
- Accessory 3 items
- Angled Grip 5 items
- Anti Walk Pins 1 item
- AR-10/LR308 Barrel 18 items
- AR-10 / LR 308 Charging Handle 4 items
- AR-10 Complete Upper Receiver 1 item
- AR-10 Partial Upper Receiver 1 item
- AR-10 Handguard 6 items
- AR-10 Receiver Set 3 items
- AR-10 Stripped Lower Receiver 4 items
- AR-10 Stripped Upper Receiver 2 items
- AR-15 Assembled Upper Receiver 3 items
- AR-15 Barrel 93 items
- AR-15 Charging Handle 15 items
- AR-15 Complete Lower Receiver 24 items
- AR-15 Complete Upper Receiver 30 items
- AR-15 Partial Upper Receiver 25 items
- AR-15 Handguard 27 items
- AR-15 Receiver Set 13 items
- AR-15 Stripped Lower Receiver 29 items
- AR-15 Stripped Upper Receiver 24 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Lower Receiver 4 items
- AR-9 Complete Lower Receiver 1 item
- AR-9 Receiver Set 2 items
- AR-9 Upper Receiver 4 items
- Blast Shield 4 items
- Bolt 9 items
- Bolt-Action Barrel 23 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 44 items
- Bolt Catch 10 items
- Brace 7 items
- Brace Strap 1 item
- Buffer 9 items
- Buffer Kit 9 items
- Buffer Spring 4 items
- Buffer Tube 11 items
- Builders Kit 1 item
- Cam Pin 2 items
- Castle Nut 1 item
- Charging Handle 14 items
- Chassis 10 items
- Compensator 18 items
- Complete Upper 10 items
- Dust Cover 3 items
- End Cap 5 items
- End Plate 4 items
- Firing Pin 1 item
- Flash Hider 22 items
- Forearm Accesory 6 items
- Forward Assist 4 items
- Gas Block 23 items
- Gas Tube 2 items
- Grip Accessory 2 items
- Grip Module 1 item
- Gunsmithing Tool 1 item
- Handguard 32 items
- Handgun 1 item
- Handstop 15 items
- Iron Sight 1 item
- Key Screw 1 item
- Lower Parts Kit 12 items
- Lower Receiver 5 items
- Magazine Catch 3 items
- Magazine Release 10 items
- Magwell 4 items
- Muzzle Brake 48 items
- Muzzle Device Accessory 13 items
- Parts Kit 1 item
- Patch 1 item
- Pistol Grip 16 items
- Pistol Part 1 item
- Piston System 2 items
- Port Door 1 item
- Port Door Rod 2 items
- Rail Adapter 5 items
- Rail Panel 3 items
- Rail Section 2 items
- Recoil Spring 1 item
- Retainer Pin 1 item
- Roll Pin 1 item
- Safety Selector 21 items
- Shim Set 3 items
- Sig MPX Barrel 1 item
- Sight Post 4 items
- Sling Mount 1 item
- Spring 1 item
- Steyr Aug Barrel 1 item
- Stock 35 items
- Stock Accessory 6 items
- Stock Adapter 7 items
- Suppressor 1 item
- Suppressor Adapter 1 item
- Take Down / Pivot Pins 7 items
- Trigger 45 items
- Trigger Guard 3 items
- Trigger Spring 1 item
- Upper Parts Kit 1 item
- Vertical Grip 13 items
Rail Length
- 3" 1 item
- 4" 1 item
- 5" 2 items
- 5.5" 1 item
- 6.0" 3 items
- 6.25" 1 item
- 6.7" 2 items
- 6.91" 1 item
- 7" 10 items
- 7.2" 1 item
- 7.25" 1 item
- 7.9" 1 item
- 8" 2 items
- 8.25" 1 item
- 9" 5 items
- 9.15" 1 item
- 9.5" 7 items
- 9.55" 1 item
- 9.6" 1 item
- 9.75" 1 item
- 10" 15 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 3 items
- 10.64" 1 item
- 10.7" 1 item
- 10.75" 1 item
- 10.8" 1 item
- 11" 2 items
- 11.5" 3 items
- 11.7" 1 item
- 12" 11 items
- 12.5" 4 items
- 12.625" 1 item
- 13" 4 items
- 13.5" 5 items
- 13.6" 1 item
- 13.625" 1 item
- 13.7" 5 items
- 13.8" 1 item
- 14" 3 items
- 15" 33 items
- 15.8" 1 item
- 16" 1 item
- 16.5" 2 items
- 17" 2 items
- 18" 2 items
Size
Thread Pitch
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