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 5.56 NATO Barrel - 6.75" Satin (Contract Overrun)Special Price $114.92 Regular Price $215.00
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Airborne Arms AAZ9 Warthog 9mm Linear Compensator - 1/2x36Special Price $59.92 Regular Price $84.95
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Shopping Options
- Price $0.00 - $999.99 Remove This Item
Barrel Length
- 3.1" 1 item
- 4" 3 items
- 4.5" 3 items
- 5" 2 items
- 5.25" 1 item
- 5.5" 8 items
- 6" 5 items
- 6.5" 2 items
- 6.75" 1 item
- 7" 3 items
- 7.25" 1 item
- 7.5" 10 items
- 7.75" 1 item
- 8" 7 items
- 8.3" 1 item
- 8.5" 7 items
- 9" 1 item
- 10" 2 items
- 10.3" 4 items
- 10.5" 31 items
- 10.7" 4 items
- 11.5" 10 items
- 12" 4 items
- 12.3" 1 item
- 12.5" 17 items
- 13.5" 1 item
- 13.7" 5 items
- 13.9" 5 items
- 14.5" 22 items
- 16" 88 items
- 16" Dissipator 1 item
- 16.1" 1 item
- 16.3" 1 item
- 17" 1 item
- 18" 57 items
- 20" 19 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 3 items
- .223/5.56 18 items
- .223 Rem 1 item
- .223 Wylde 20 items
- .30 Cal 8 items
- .308 17 items
- .308 Win 24 items
- .45 ACP 4 items
- .458 Socom 1 item
- 12 Gauge 1 item
- 300 Blackout 15 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 8 items
- 5.56 NATO 68 items
- 5.56mm 11 items
- 6mm ARC 8 items
- 6.5 Creedmoor 25 items
- 6.5 Grendel 9 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 11 items
- 7.62mm 3 items
- 7.62x39 4 items
- 7.62x51 5 items
- 8.6 Blackout 7 items
- 9mm 45 items
Category
- Receiver Parts 157 items
- Parts & Kits 225 items
- Barrels 102 items
- Rifle Barrels 136 items
- Buffer Systems 48 items
- Trigger Parts 112 items
- Gas Systems 51 items
- Muzzle Devices 182 items
- Bolt Parts 60 items
- Grips 144 items
- Charging Handles 69 items
- Rifle Handguards 140 items
- Stocks & Braces 133 items
- MILSPEC Parts 43 items
Configuration
- 90 Degree 1 item
- AR-10 3 items
- AR-15 20 items
- Clamp on Piston Block 1 item
- Curved 18 items
- Flat 18 items
- Gen 3 2 items
- Left 1 item
- Left Hand 1 item
- M-LOK 8 items
- Normal CQR 2 items
- Restricted CQR 2 items
- Rifle 2 items
- Right Hand 1 item
- Solid Piston Block 1 item
- Straight 7 items
- .625 DIA 7 items
- .750 DIA 13 items
- .800 DIA 2 items
- .875 DIA 5 items
- .936 DIA 5 items
- 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
- Bead Blast 4 items
- Bead Blast Stainless Steel 1 item
- Black 17 items
- Black Nitride 1 item
- Blue 1 item
- Carbon Fiber 2 items
- Cerakote 2 items
- DLC 4 items
- FDE 3 items
- Gold 1 item
- Grey 1 item
- Melonite 2 items
- NiB-X 3 items
- Nickel Boron 3 items
- Nitride 51 items
- Nitromet 6 items
- Phosphate 6 items
- Polished 19 items
- Red 2 items
- Satin 21 items
- Anodize 40 items
- PVD/CVD 2 items
- Quench Polish Quench (QPQ) 7 items
Gas Length
Inside Diameter
Manufacturer
- 21st Tec 6 items
- A3 Tactical 31 items
- Accu-Tac 2 items
- Advanced Armament Company (AAC) 4 items
- Aero Precision 18 items
- Airborne Arms 4 items
- ALG Defense 4 items
- American Trigger Company (ATC) 3 items
- Andro Corp Industries 8 items
- Angstadt Arms 3 items
- Apex Tactical Specialties 4 items
- Arisaka 6 items
- Armaspec 3 items
- Arms Republic 9 items
- Ascalon Arms 7 items
- Brügger & Thomet (B&T) 2 items
- B5 Systems 9 items
- Ballistic Advantage 20 items
- Battle Arms Development 14 items
- Black River MFG 1 item
- Blitzkrieg Components 11 items
- BOBRO 1 item
- Bootleg 2 items
- Boss Barrels 8 items
- Bravo Company MFG (BCM) 52 items
- Breek Arms 1 item
- Brigand Arms 2 items
- Centurion Arms 6 items
- Chisel Machining 4 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 9 items
- Daniel Defense 10 items
- Dead Air Armament 6 items
- Dead Foot Arms LLC 9 items
- Devil Dog Concepts 1 item
- Die Free Co 1 item
- DPM Systems Technologies 4 items
- Drew Meyers Defense 4 items
- Driven Arms Co. 12 items
- Elftmann Tactical 5 items
- Emissary Development 6 items
- Ergo Grips 1 item
- F-1 Firearms 3 items
- F5 MFG 1 item
- Faxon Firearms 24 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 50 items
- Forward Controls Design 85 items
- FosTecH 1 item
- Gear Head Works 1 item
- Geissele 20 items
- Grand Power 2 items
- Grey Ghost Precision 2 items
- Griffin Armament 19 items
- Half Cocked Arms (HCA) 1 item
- HB Industries 15 items
- HERA ARMS 13 items
- Heresy Design 5 items
- Hiperfire 10 items
- HUXWRX 1 item
- Icarus Precision 2 items
- Icon Defense 5 items
- Iron City Rifle Works 1 item
- Jacob Grey 2 items
- James Madison Tactical (JMT) 2 items
- JK Armament 15 items
- JL Billet 5 items
- JMAC Customs 63 items
- JP Enterprises Inc 31 items
- Killer Innovations 1 item
- Kinetic Development Group 4 items
- Knight’s Armament Company (KAC) 2 items
- KNS Precision 10 items
- Kaw Valley Precision 2 items
- Kratos Design Group 3 items
- Krebs Customs 6 items
- KynSHOT 4 items
- Lancer Systems 1 item
- Lantac 9 items
- Law Tactical 1 item
- Lee Sporting 1 item
- Leitner-Wise 1 item
- Lewis Machine & Tool (LMT) 19 items
- LUTH-AR 3 items
- Mad Pig 5 items
- Mag-Pod 1 item
- Magpul Industries 68 items
- Maxim Defense 15 items
- Mega Arms 1 item
- Midwest Industries 9 items
- Mission First Tactical 3 items
- Multitasker Tools 1 item
- NEMO Arms 5 items
- Neverwear Springs 1 item
- Next Level Armament 22 items
- NIGHT FISION 1 item
- Noveske 24 items
- Odin Works 2 items
- Patriot Ordnance Factory (POF) 7 items
- Precision Armament 13 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 4 items
- Q, LLC 7 items
- Quarter Circle 10 9 items
- R&D Precision 3 items
- Radian Weapons 15 items
- Raidworx 1 item
- Rainier Arms, LLC 145 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 5 items
- SCALARWORKS 1 item
- Seekins Precision 3 items
- Sharps Bros 20 items
- Shooting Innovations 1 item
- Sig Sauer 4 items
- Silencerco 5 items
- Sionics Weapon Systems 1 item
- SLR Rifleworks 3 items
- Sons of Liberty Gun Works 33 items
- Spinta Precision 2 items
- Sprinco (Tactical Springs) 7 items
- Stag Arms 2 items
- Stern Defense 5 items
- Strike Industries 36 items
- Superlative Arms 14 items
- Surefire 4 items
- Tactical Edge Arms 3 items
- Tango Down 1 item
- Taran Tactical Innovations 1 item
- Timney Triggers 31 items
- Tippmann Arms 1 item
- Triggertech 7 items
- TruCalibre 6 items
- True North Concepts 9 items
- Tyrant Designs 13 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 54 items
- VKTR Industries 2 items
- VLTOR 10 items
- White Label Armory 2 items
- WMD Guns 13 items
- WOOX 4 items
Model
Option
- AK-47/74 8 items
- AR-9 4 items
- AR-10 35 items
- AR-15 175 items
- FN 509 1 item
- Standard 1 item
- 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
- Long 1 item
- Front 1 item
- Mid 1 item
- Rear 1 item
- Remington 700 Short Action 3 items
- Remington 700 Short Action BDL 1 item
- WA 1 item
- KS 1 item
- 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 1 item
- CZ 14 items
- FNH 1 item
- Glock 1 item
- Heckler & Koch 1 item
- Remington 1 item
- Sharps Bros 1 item
- Sig Sauer 2 items
- Springfield 1 item
- Holed 1 item
- Profile 1 item
- Small Lever 2 items
- Large Lever 1 item
- Green Laser 2 items
- Adjustable 11 items
- Non-Adjustable 21 items
- IWI Uzi Pro 1 item
- B&T APC 1 item
- Dimpled 3 items
- Serrated 5 items
Platform
Price
Product Type
- Accessory 4 items
- Adapter Plate 1 item
- AK Accessories 1 item
- Angled Grip 19 items
- Anti Walk Pins 2 items
- AR-10 Barrel 8 items
- AR-10 / LR 308 Charging Handle 6 items
- AR-10 Complete Lower Receiver 1 item
- AR-10 Complete Upper Receiver 1 item
- AR-10 Handguard 3 items
- AR-10 Receiver Set 3 items
- AR-10 Stripped Lower Receiver 3 items
- AR-10 Stripped Upper Receiver 1 item
- AR-15 Assembled Upper Receiver 5 items
- AR-15 Barrel 20 items
- AR-15 Charging Handle 32 items
- AR-15 Complete Lower Receiver 8 items
- AR-15 Complete Upper Receiver 9 items
- AR-15 Partial Upper Receiver 28 items
- AR-15 Handguard 53 items
- AR-15 Receiver Set 16 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 37 items
- AR-15 Stripped Upper Receiver 19 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Complete Lower Receiver 1 item
- AR-9 Receiver Set 3 items
- AR-9 Upper Receiver 2 items
- Barrel 132 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 3 items
- Bolt 7 items
- Bolt-Action Barrel 37 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 35 items
- Bolt Catch 19 items
- Brace 17 items
- Brace Strap 1 item
- Buffer 23 items
- Buffer Kit 6 items
- Buffer Spring 12 items
- Buffer Tube 13 items
- Cam Pin 6 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 37 items
- Chassis 16 items
- Cheek Riser 4 items
- Compensator 45 items
- Complete Upper 1 item
- Crush Washer 3 items
- Dust Cover 13 items
- End Cap 9 items
- End Plate 11 items
- Failure Resistant Extractor 2 items
- Finger Stop 2 items
- Firing Pin 4 items
- Flash Hider 49 items
- Forearm Accesory 17 items
- Forward Assist 11 items
- Forward Assist Spring 1 item
- Front Sight 2 items
- Gas Block 37 items
- Gas Rings 3 items
- Gas Tube 4 items
- Grip Accessory 10 items
- Grip Module 1 item
- Grip Screw 1 item
- Handguard 49 items
- Handguard Adaptor 2 items
- Handstop 32 items
- Iron Sight 1 item
- Key Screw 1 item
- Lower Parts Kit 16 items
- Lower Receiver 2 items
- Magazine 1 item
- Magazine Button 2 items
- Magazine Catch 9 items
- Magazine Release 18 items
- Magazine Spring 1 item
- Magwell 4 items
- Muzzle Brake 70 items
- Muzzle Device Accessory 12 items
- Parts Kit 14 items
- Pistol Grip 57 items
- Pistol Part 1 item
- Piston 1 item
- Piston System 7 items
- Port Door 4 items
- Port Door Rod 6 items
- Port Door Spring 1 item
- Rail Adapter 8 items
- Rail Cover 2 items
- Rail Panel 13 items
- Rail Section 1 item
- Recoil Spring 1 item
- Retainer Pin 4 items
- Roll Pin 2 items
- Safety Selector 35 items
- Shim Set 3 items
- Sight Post 10 items
- Silent Captured Spring 1 item
- Spring 8 items
- Stock 68 items
- Stock Accessory 17 items
- Stock Adapter 22 items
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 18 items
- Trigger 92 items
- Trigger / Hammer Pins 3 items
- Trigger Guard 15 items
- Upper Parts Kit 2 items
- Vertical Grip 26 items
Rail Length
- 3.25" 1 item
- 4" 1 item
- 4.25" 4 items
- 4.5" 2 items
- 4.9" 1 item
- 5.5" 1 item
- 5.99" 1 item
- 6.0" 5 items
- 6.25" 2 items
- 6.375" 1 item
- 6.5" 2 items
- 6.7" 4 items
- 6.75" 3 items
- 7" 16 items
- 7.25" 2 items
- 7.3" 1 item
- 7.5" 2 items
- 7.8" 1 item
- 7.9" 2 items
- 8" 4 items
- 8.5" 1 item
- 8.6" 1 item
- 9" 10 items
- 9.1" 1 item
- 9.2" 2 items
- 9.25" 2 items
- 9.3" 2 items
- 9.5" 15 items
- 9.55" 6 items
- 9.59" 1 item
- 9.6" 4 items
- 9.75" 1 item
- 10" 17 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 10 items
- 10.64" 2 items
- 10.7" 3 items
- 10.75" 1 item
- 10.8" 1 item
- 11" 5 items
- 11.25" 1 item
- 11.5" 9 items
- 11.7" 4 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 18 items
- 12.3" 1 item
- 12.4" 1 item
- 12.43" 1 item
- 12.5" 8 items
- 12.55" 1 item
- 12.6" 3 items
- 12.8" 1 item
- 13" 9 items
- 13.25" 2 items
- 13.5" 12 items
- 13.7" 5 items
- 13.75" 1 item
- 13.8" 5 items
- 14" 8 items
- 14.3" 1 item
- 15" 37 items
- 15.3" 4 items
- 15.5" 1 item
- 15.8" 1 item
- 16.3" 1 item
- 16.5" 4 items
- 17" 2 items
- 18" 1 item
Size
Thread Pitch
Twist Rate
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