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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Sharps Bros Hellbreaker AR-15 Complete Lower Receiver w/o stock - Gen 2Special Price $299.99 Regular Price $399.95
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Sharps Bros Warthog AR-15 Complete Lower Receiver w/o stock - Gen 2Special Price $319.99 Regular Price $399.95
Shop By
Shopping Options
Barrel Length
- 3.1" 1 item
- 4" 3 items
- 4.5" 3 items
- 5" 2 items
- 5.25" 1 item
- 5.5" 11 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" 2 items
- 8" 8 items
- 8.3" 1 item
- 8.5" 8 items
- 8.75" 1 item
- 9" 1 item
- 10" 2 items
- 10.3" 14 items
- 10.5" 32 items
- 10.7" 4 items
- 11.5" 12 items
- 11.85" 2 items
- 12" 4 items
- 12.3" 1 item
- 12.5" 17 items
- 13" 3 items
- 13.5" 1 item
- 13.7" 6 items
- 13.9" 6 items
- 14.5" 24 items
- 16" 90 items
- 16" Dissipator 1 item
- 16.1" 3 items
- 16.3" 1 item
- 17" 1 item
- 18" 58 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 23 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 21 items
- 300 Norma Mag 1 item
- 338 Lapua 2 items
- 5.56X45 9 items
- 5.56 NATO 80 items
- 5.56mm 12 items
- 6mm ARC 8 items
- 6.5 Creedmoor 25 items
- 6.5 Grendel 10 items
- 6.5 PRC 2 items
- 6.8 SPC 3 items
- 6MM Creedmoor 11 items
- 7.62mm 4 items
- 7.62x39 9 items
- 7.62x51 5 items
- 8.6 Blackout 7 items
- 9mm 48 items
Category
- Receiver Parts 198 items
- Parts & Kits 223 items
- Barrels 102 items
- Rifle Barrels 135 items
- Buffer Systems 48 items
- Trigger Parts 112 items
- Gas Systems 51 items
- Muzzle Devices 185 items
- Bolt Parts 58 items
- Grips 146 items
- Charging Handles 70 items
- Rifle Handguards 145 items
- Stocks & Braces 132 items
- MILSPEC Parts 43 items
Configuration
- 90 Degree 1 item
- AR-10 3 items
- AR-15 21 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
- Mil-Spec 1 item
- 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
- 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 1 item
- 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 5 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 5 items
- Polished 19 items
- Red 2 items
- Satin 21 items
- Anodize 42 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 19 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 4 items
- Arms Republic 9 items
- Ascalon Arms 7 items
- Brügger & Thomet (B&T) 2 items
- B5 Systems 9 items
- Ballistic Advantage 19 items
- Battle Arms Development 14 items
- Blackout Defense 1 item
- Black River MFG 1 item
- Blitzkrieg Components 12 items
- BOBRO 1 item
- Bootleg 3 items
- Boss Barrels 8 items
- Bravo Company MFG (BCM) 54 items
- Breek Arms 1 item
- Brigand Arms 2 items
- Centurion Arms 7 items
- Chisel Machining 5 items
- Christensen Arms 5 items
- CMC Triggers 1 item
- Cobalt Kinetics 1 item
- Cross Machine Tool (CMT) 9 items
- Daniel Defense 14 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 4 items
- F5 MFG 1 item
- Faxon Firearms 23 items
- Ferfrans 1 item
- Flatline Fiber Co 1 item
- Fortis MFG 50 items
- Forward Controls Design 83 items
- FosTecH 1 item
- Gear Head Works 1 item
- Geissele 16 items
- Grand Power 1 item
- Grey Birch MFG 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 7 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 65 items
- JP Enterprises Inc 27 items
- Killer Innovations 1 item
- Kinetic Development Group 4 items
- Knight’s Armament Company (KAC) 4 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 25 items
- MCM Firearms 1 item
- 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) 8 items
- Precision Armament 13 items
- Precision Reflex Inc 2 items
- Primary Weapon Systems 10 items
- Q, LLC 10 items
- Quarter Circle 10 9 items
- R&D Precision 3 items
- Radian Weapons 15 items
- Raidworx 1 item
- Rainier Arms, LLC 149 items
- Rainier Industries 15 items
- Rehv Arms 2 items
- Reptilia Corp 9 items
- Rex Silentium 1 item
- Riflespeed 3 items
- Rise Armament 18 items
- RogueOps 3 items
- RS Regulate 6 items
- Rubber City Armory 1 item
- SB Tactical 5 items
- SCALARWORKS 1 item
- Seekins Precision 4 items
- Sharps Bros 25 items
- Shooting Innovations 1 item
- Sig Sauer 7 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 32 items
- Tippmann Arms 1 item
- Triggertech 7 items
- Troy Industries 2 items
- TruCalibre 6 items
- True North Concepts 9 items
- Tyrant Designs 14 items
- Underground Tactical 1 item
- Unity Tactical 1 item
- V Seven Weapon Systems 52 items
- VKTR Industries 3 items
- VLTOR 10 items
- White Label Armory 2 items
- WMD Guns 13 items
- WOOX 5 items
Model
Option
- AK-47/74 8 items
- AR-9 4 items
- AR-10 35 items
- AR-15 177 items
- FN 509 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
- 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 4 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 2 items
- AR-10 Handguard 3 items
- AR-10 Receiver Set 2 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 33 items
- AR-15 Complete Lower Receiver 12 items
- AR-15 Complete Upper Receiver 30 items
- AR-15 Partial Upper Receiver 29 items
- AR-15 Handguard 54 items
- AR-15 Receiver Set 16 items
- AR-15 Rifle 1 item
- AR-15 Stripped Lower Receiver 38 items
- AR-15 Stripped Upper Receiver 20 items
- AR-15 Upper Receiver Group 1 item
- AR-9 Complete Lower Receiver 1 item
- AR-9 Partial Upper Receiver 1 item
- AR-9 Receiver Set 3 items
- AR-9 Upper Receiver 2 items
- Barrel 131 items
- Barrel Adapter 2 items
- Barrel Nut 4 items
- Blast Shield 3 items
- Bolt 8 items
- Bolt-Action Barrel 37 items
- Bolt-Action Receiver 1 item
- Bolt Carrier Group 32 items
- Bolt Catch 19 items
- Brace 16 items
- Brace Strap 1 item
- Buffer 24 items
- Buffer Kit 6 items
- Buffer Spring 11 items
- Buffer Tube 12 items
- Cam Pin 6 items
- Castle Nut 5 items
- Castle Nut / End Plate 8 items
- Cable Clip 1 item
- Charging Handle 37 items
- Chassis 20 items
- Cheek Riser 4 items
- Compensator 46 items
- Complete Upper 8 items
- 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 50 items
- Forearm Accesory 18 items
- Forward Assist 10 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
- Handgun 1 item
- Handstop 31 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 16 items
- Magazine Spring 1 item
- Magwell 4 items
- Muzzle Brake 70 items
- Muzzle Device Accessory 13 items
- Parts Kit 16 items
- Pistol Grip 59 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 2 items
- Recoil Spring 1 item
- Retainer Pin 5 items
- Roll Pin 2 items
- Safety Selector 34 items
- Shim Set 4 items
- Sight Post 10 items
- Silent Captured Spring 1 item
- Sling Mount 1 item
- Spring 8 items
- Stock 68 items
- Stock Accessory 17 items
- Stock Adapter 22 items
- Suppressor 1 item
- Suppressor Accessory 1 item
- Take Down / Pivot Pins 16 items
- Trigger 92 items
- Trigger / Hammer Pins 3 items
- Trigger Guard 15 items
- Upper Parts Kit 2 items
- Vertical Grip 27 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" 17 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" 17 items
- 9.55" 6 items
- 9.59" 1 item
- 9.6" 4 items
- 9.75" 1 item
- 10" 19 items
- 10.25" 1 item
- 10.3" 1 item
- 10.5" 9 items
- 10.64" 2 items
- 10.7" 3 items
- 10.75" 1 item
- 10.8" 1 item
- 11" 6 items
- 11.25" 1 item
- 11.5" 9 items
- 11.7" 4 items
- 11.75" 2 items
- 11.8" 4 items
- 12" 19 items
- 12.3" 1 item
- 12.4" 1 item
- 12.43" 1 item
- 12.5" 10 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" 6 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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