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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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Items 17-32 of 251

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  1. Aero Precision Low Profile Gas Block - .750 Nitride
    Aero Precision Low Profile Gas Block - .750 Nitride
    $35.99
    Out of stock
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  2. Centurion Arms AST AR-15 Advanced Sniper Trigger - 2-Stage
    Centurion Arms AST AR-15 Advanced Sniper Trigger - 2-Stage
    $88.82
    Out of stock
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  3. Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    $84.96
    Out of stock
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  4. Aero Precision Upper Parts Kit
    Aero Precision Upper Parts Kit
    Out of stock
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  5. Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    $49.95
    Out of stock
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  6. Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    $74.95
    Out of stock
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  7. Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    $35.99
    Out of stock
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  8. Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    $15.95
    Out of stock
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  9. Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    $40.00
    Out of stock
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  10. Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    $22.95
    Out of stock
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  11. JP Enterprises Reduced Power Spring Kit
    JP Enterprises Reduced Power Spring Kit
    $10.40
    Out of stock
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  12. KNS Precision AR15 AR/MCX Stock Adapter With Flange
    KNS Precision AR15 AR/MCX Stock Adapter With Flange
    $51.00
    Out of stock
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  13. Aero Precision Low Profile Adjustable Gas Block - .625
    Aero Precision Low Profile Adjustable Gas Block - .625
    $71.99
    Out of stock
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  14. Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Out of stock
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  15. Dead Air Sandman Flash Hider Front Cap - 5.56
    Dead Air Sandman Flash Hider Front Cap - 5.56
    $89.00
    Out of stock
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  16. James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    $14.95
    Out of stock
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Items 17-32 of 251

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Barrel Length
  1. 5.5" 1 item
  2. 10.3" 1 item
  3. 16" 4 items
  4. 18" 5 items
Caliber
  1. .223/5.56 2 items
  2. .30 Cal 4 items
  3. .308 1 item
  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 1 item
  7. 5.56 NATO 2 items
  8. 5.56mm 2 items
  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
  11. 7.62x51 1 item
  12. 8.6 Blackout 1 item
  13. 9mm 6 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 64 items
  3. Rifle Barrels 2 items
  4. Buffer Systems 17 items
  5. Trigger Parts 18 items
  6. Gas Systems 20 items
  7. Muzzle Devices 35 items
  8. Bolt Parts 5 items
  9. Grips 34 items
  10. Charging Handles 19 items
  11. Rifle Handguards 16 items
  12. Stocks & Braces 9 items
  13. MILSPEC Parts 3 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 7 items
  3. Cross 1 item
  4. Flaming Pig 1 item
  5. Gen 1-3 1 item
  6. GEN 2 1 item
  7. Ghetto Blaster 1 item
  8. M-LOK 3 items
  9. .625 DIA 3 items
  10. .750 DIA 3 items
  11. .936 DIA 1 item
Finish
  1. Black 6 items
  2. Black Nitride 1 item
  3. Cerakote 1 item
  4. DLC 1 item
  5. FDE 1 item
  6. NiB-X 1 item
  7. Nickel Boron 1 item
  8. Nitride 5 items
  9. Nitromet 1 item
  10. Red 2 items
  11. Anodize 7 items
  12. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 7 items
  3. .875" 1 item
Gas Length
  1. Pistol 1 item
  2. Carbine 1 item
  3. Mid 5 items
  4. Intermediate 6 items
  5. Rifle 2 items
Height
  1. Absolute Co-Witness 1 item
Is Firearms?
  1. No 251 items
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 12 items
  3. Aeroknox 7 items
  4. ALG Defense 1 item
  5. Angstadt Arms 3 items
  6. Apex Tactical Specialties 1 item
  7. Armaspec 8 items
  8. Arms Republic 3 items
  9. Ascalon Arms 3 items
  10. B5 Systems 1 item
  11. Ballistic Advantage 5 items
  12. Battle Arms Development 25 items
  13. Blackout Defense 1 item
  14. Blitzkrieg Components 5 items
  15. Bravo Company MFG (BCM) 5 items
  16. Centurion Arms 1 item
  17. Cross Machine Tool (CMT) 2 items
  18. Dead Air Armament 1 item
  19. Drew Meyers Defense 4 items
  20. Driven Arms Co. 2 items
  21. Elftmann Tactical 1 item
  22. Ergo Grips 7 items
  23. Faxon Firearms 7 items
  24. Fortis MFG 4 items
  25. Forward Controls Design 4 items
  26. Geissele 4 items
  27. Griffin Armament 6 items
  28. HB Industries 7 items
  29. HERA ARMS 4 items
  30. Hiperfire 4 items
  31. James Madison Tactical (JMT) 1 item
  32. JMAC Customs 3 items
  33. JP Enterprises Inc 2 items
  34. Kinetic Development Group 4 items
  35. Knight’s Armament Company (KAC) 3 items
  36. KNS Precision 3 items
  37. Kalashnikov USA 1 item
  38. Krebs Customs 2 items
  39. Lantac 4 items
  40. Mad Pig 1 item
  41. Magpul Industries 9 items
  42. Midwest Industries 1 item
  43. NEMO Arms 1 item
  44. Next Level Armament 4 items
  45. Noveske 6 items
  46. Obsidian Arms 1 item
  47. Patriot Ordnance Factory (POF) 1 item
  48. Precision Armament 2 items
  49. Primary Weapon Systems 3 items
  50. Q, LLC 3 items
  51. Radian Weapons 1 item
  52. Rainier Arms, LLC 3 items
  53. SB Tactical 2 items
  54. Sharps Bros 1 item
  55. Silencerco 7 items
  56. Sionics Weapon Systems 1 item
  57. SLR Rifleworks 1 item
  58. Sons of Liberty Gun Works 1 item
  59. Spinta Precision 1 item
  60. Springer Precision 1 item
  61. Stern Defense 1 item
  62. Strike Industries 1 item
  63. Surefire 2 items
  64. Taran Tactical Innovations 1 item
  65. Troy Industries 1 item
  66. TruCalibre 3 items
  67. V Seven Weapon Systems 3 items
  68. VLTOR 2 items
  69. WMD Guns 2 items
Model
  1. CZ Scorpion 6 items
  2. Sig MPX 1 item
Mount
  1. KeyMod 4 items
  2. M-LOK 21 items
  3. Picatinny 11 items
Option
  1. AK-47/74 4 items
  2. AR-10 4 items
  3. AR-15 34 items
  4. SRS-C 3.3 oz. 1 item
  5. SRS-H 3.8 oz. 1 item
  6. SRS-H2 4.7 oz. 1 item
  7. SRS-H3 5.6 oz. 1 item
  8. SRS-BB 5.7 oz. 1 item
  9. SRS-9mm 6.4 oz. 1 item
  10. SRS-AR10 5.7 oz. 1 item
  11. CZ 13 items
  12. Small Lever 1 item
  13. Large Lever 2 items
  14. Adjustable 3 items
  15. Non-Adjustable 12 items
Platform
  1. AR-15 7 items
  2. CZ-USA 6 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 10 items
  2. $10.00 - $19.99 32 items
  3. $20.00 - $29.99 28 items
  4. $30.00 - $39.99 39 items
  5. $40.00 - $49.99 24 items
  6. $50.00 - $59.99 27 items
  7. $60.00 - $69.99 17 items
  8. $70.00 - $79.99 28 items
  9. $80.00 - $89.99 22 items
  10. $90.00 and above 24 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 6 items
  4. Anti Walk Pins 3 items
  5. AR-10 / LR 308 Charging Handle 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Charging Handle 9 items
  8. AR-15 Stripped Lower Receiver 2 items
  9. AR-15 Stripped Upper Receiver 1 item
  10. AR-9 Upper Receiver 1 item
  11. Barrel 2 items
  12. Blast Shield 1 item
  13. Bolt 2 items
  14. Bolt Catch 6 items
  15. Brace 2 items
  16. Buffer 8 items
  17. Buffer Kit 3 items
  18. Buffer Tube 5 items
  19. Cam Pin 1 item
  20. Charging Handle 6 items
  21. Compensator 5 items
  22. Dust Cover 2 items
  23. End Plate 3 items
  24. Firing Pin 2 items
  25. Flash Hider 7 items
  26. Forearm Accesory 4 items
  27. Forward Assist 1 item
  28. Gas Block 17 items
  29. Gas Tube 2 items
  30. Grip Module 1 item
  31. Gunsmithing Tool 1 item
  32. Handguard 1 item
  33. Handstop 13 items
  34. Lower Parts Kit 7 items
  35. Magazine Catch 2 items
  36. Magazine Release 5 items
  37. Magwell 1 item
  38. Muzzle Brake 21 items
  39. Muzzle Device Accessory 1 item
  40. Patch 1 item
  41. Pistol Grip 9 items
  42. Port Door 1 item
  43. Rail Adapter 1 item
  44. Rail Panel 4 items
  45. Rail Section 1 item
  46. Recoil Spring 1 item
  47. Retainer Pin 1 item
  48. Safety Selector 17 items
  49. Shim Set 2 items
  50. Sight Post 4 items
  51. Sling Mount 2 items
  52. Spring 1 item
  53. Stock 3 items
  54. Stock Accessory 1 item
  55. Stock Adapter 4 items
  56. Take Down / Pivot Pins 6 items
  57. Trigger 8 items
  58. Trigger / Hammer Pins 1 item
  59. Trigger Guard 2 items
  60. Trigger Spring 1 item
  61. Upper Parts Kit 1 item
  62. Vertical Grip 5 items
  63. Weight 1 item
Rail Length
  1. 10" 4 items
  2. 12" 6 items
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 9 items
Thread Pitch
  1. 1/2x28 19 items
  2. 5/8x24 6 items
  3. 5/8x32 1 item
  4. 11/16x24 1 item
  5. M24x1.5 RH 1 item
Threaded
  1. Yes 2 items
Twist Rate
  1. 1:10 1 item
Stock Status
  1. Out of stock 251 items Remove This Item
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