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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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  1. Geissele Super Gas Block - Black
    Geissele Super Gas Block - Black
    $80.00
    Out of stock
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  2. Milspec/GI Carbine Buffer - 3.0oz
    Milspec/GI Carbine Buffer - 3.0oz
    $12.00
    Out of stock
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  3. Milspec/GI M16/Rifle Buffer Tube
    Milspec/GI M16/Rifle Buffer Tube
    $30.00
    Out of stock
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  4. Precision Armament - M4-72 Tactical Compensator 5.56mm
    Precision Armament - M4-72 Tactical Compensator 5.56mm
    $85.49
    Out of stock
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  5. Battle Arms Development Enhanced Pins Set
    Battle Arms Development Enhanced Pins Set
    Special Price $16.92 Regular Price $28.45
    Out of stock
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  7. Lantac RPS END PLATE & CASTLE NUT
    Lantac RPS END PLATE & CASTLE NUT
    $54.99
    Out of stock
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  8. Reptilia Corp AR-15/SR-25 CQG Pistol Grip - Black
    Reptilia Corp AR-15/SR-25 CQG Pistol Grip - Black
    $19.76
    Out of stock
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  9. Magpul MIAD Gen 1.1 Grip Kit AR15 - Black
    Magpul MIAD Gen 1.1 Grip Kit AR15 - Black
    $37.95
    Out of stock
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  11. ERGO 4 Slot M-LOK Slot Cover 4 Pack
    ERGO 4 Slot M-LOK Slot Cover 4 Pack
    Out of stock
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  13. V Seven Weapon Systems Endplate / Castle Nut Combo
    V Seven Weapon Systems Endplate / Castle Nut Combo
    $61.11
    Out of stock
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  15. V Seven Weapon Systems Titanium Mag Catch / Release
    V Seven Weapon Systems Titanium Mag Catch / Release
    $50.44
    Out of stock
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  16. V Seven Weapon Systems Ultra Light Mag Catch / Release
    V Seven Weapon Systems Ultra Light Mag Catch / Release
    $36.86
    Out of stock
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Items 209-224 of 327

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  1. Price $0.00 - $99.99 Remove This Item
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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 7.25" 1 item
  4. 16" 8 items
  5. 18" 5 items
Caliber
  1. .223/5.56 4 items
  2. .30 Cal 3 items
  3. .308 1 item
  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 2 items
  7. 5.56 NATO 4 items
  8. 5.56mm 2 items
  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
  11. 7.62x51 2 items
  12. 8.6 Blackout 2 items
  13. 9mm 8 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 100 items
  3. Barrels 3 items
  4. Buffer Systems 17 items
  5. Trigger Parts 17 items
  6. Gas Systems 22 items
  7. Muzzle Devices 53 items
  8. Bolt Parts 8 items
  9. Grips 42 items
  10. Charging Handles 25 items
  11. Rifle Handguards 20 items
  12. Stocks & Braces 11 items
  13. MILSPEC Parts 4 items
Color
Configuration
  1. AR-10 2 items
  2. AR-15 8 items
  3. Gen 1-3 1 item
  4. GEN 2 1 item
  5. Left 1 item
  6. Left Hand 1 item
  7. M-LOK 5 items
  8. .625 DIA 3 items
  9. .750 DIA 5 items
  10. .936 DIA 1 item
Finish
  1. Black 4 items
  2. Black Nitride 1 item
  3. Cerakote 1 item
  4. DLC 1 item
  5. Melonite 1 item
  6. NiB-X 1 item
  7. Nitride 5 items
  8. Nitromet 1 item
  9. Red 1 item
  10. Anodize 8 items
  11. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 2 items
  2. .750" 9 items
  3. .875" 1 item
Gas System Length
  1. Blowback 3 items
  2. Pistol 2 items
  3. Mid 6 items
  4. Intermediate 5 items
  5. Rifle 1 item
Height
  1. Absolute Co-Witness 2 items
Manufacturer
  1. A3 Tactical 6 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 12 items
  5. Aeroknox 7 items
  6. Angstadt Arms 3 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 9 items
  9. Arms Republic 1 item
  10. Ascalon Arms 4 items
  11. Brügger & Thomet (B&T) 1 item
  12. B5 Systems 1 item
  13. Ballistic Advantage 5 items
  14. Battle Arms Development 25 items
  15. Blitzkrieg Components 2 items
  16. Bravo Company MFG (BCM) 5 items
  17. Cross Machine Tool (CMT) 2 items
  18. Dead Air Armament 1 item
  19. Drew Meyers Defense 2 items
  20. Driven Arms Co. 1 item
  21. Elftmann Tactical 2 items
  22. Ergo Grips 7 items
  23. Faxon Firearms 7 items
  24. Flatline Fiber Co 1 item
  25. Fortis MFG 6 items
  26. Forward Controls Design 11 items
  27. Gear Head Works 1 item
  28. Geissele 2 items
  29. Griffin Armament 13 items
  30. HB Industries 6 items
  31. HERA ARMS 4 items
  32. Hiperfire 3 items
  33. HUXWRX 1 item
  34. James Madison Tactical (JMT) 1 item
  35. JK Armament 3 items
  36. JMAC Customs 5 items
  37. JP Enterprises Inc 2 items
  38. Kinetic Development Group 4 items
  39. Knight’s Armament Company (KAC) 2 items
  40. KNS Precision 4 items
  41. Kalashnikov USA 1 item
  42. Kratos Design Group 1 item
  43. Krebs Customs 4 items
  44. Lantac 3 items
  45. Leitner-Wise 1 item
  46. Mad Pig 2 items
  47. Mag-Pod 1 item
  48. Magpul Industries 17 items
  49. Midwest Industries 2 items
  50. NEMO Arms 1 item
  51. Next Level Armament 6 items
  52. Noveske 9 items
  53. Obsidian Arms 1 item
  54. Patriot Ordnance Factory (POF) 4 items
  55. Precision Armament 3 items
  56. Primary Weapon Systems 1 item
  57. Q, LLC 8 items
  58. R&D Precision 1 item
  59. Radian Weapons 4 items
  60. Rainier Arms, LLC 1 item
  61. Rainier Industries 1 item
  62. Reptilia Corp 1 item
  63. Rise Armament 1 item
  64. RS Regulate 1 item
  65. SB Tactical 1 item
  66. Sig Sauer 1 item
  67. Silencerco 6 items
  68. Sionics Weapon Systems 1 item
  69. SLR Rifleworks 1 item
  70. Sons of Liberty Gun Works 2 items
  71. Spinta Precision 1 item
  72. Springer Precision 1 item
  73. Stag Arms 1 item
  74. Strike Industries 2 items
  75. Surefire 2 items
  76. Taran Tactical Innovations 2 items
  77. Triggertech 1 item
  78. Troy Industries 1 item
  79. TruCalibre 4 items
  80. Tyrant Designs 1 item
  81. V Seven Weapon Systems 26 items
  82. VLTOR 4 items
  83. WMD Guns 3 items
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 9 items
  3. H&K MP5K 1 item
  4. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 26 items
  3. Picatinny 12 items
Option
  1. AK-47/74 2 items
  2. AR-10 6 items
  3. AR-15 41 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 12 items
  12. Small Lever 1 item
  13. Large Lever 2 items
  14. Green Laser 1 item
  15. Adjustable 4 items
  16. Non-Adjustable 14 items
Platform
  1. AR-15 11 items
  2. CZ 9 items
  3. H&K 2 items
  4. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 16 items
  2. $10.00 - $19.99 33 items
  3. $20.00 - $29.99 30 items
  4. $30.00 - $39.99 46 items
  5. $40.00 - $49.99 35 items
  6. $50.00 - $59.99 37 items
  7. $60.00 - $69.99 31 items
  8. $70.00 - $79.99 40 items
  9. $80.00 - $89.99 26 items
  10. $90.00 and above 33 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Adapter Plate 1 item
  4. Angled Grip 4 items
  5. Anti Walk Pins 4 items
  6. AR-10 / LR 308 Charging Handle 1 item
  7. AR-15 Assembled Upper Receiver 1 item
  8. AR-15 Barrel 3 items
  9. AR-15 Charging Handle 12 items
  10. AR-15 Stripped Lower Receiver 2 items
  11. AR-15 Stripped Upper Receiver 2 items
  12. Barrel Nut 3 items
  13. Blast Shield 1 item
  14. Bolt 2 items
  15. Bolt Catch 8 items
  16. Brace 1 item
  17. Brace Strap 1 item
  18. Buffer 6 items
  19. Buffer Kit 2 items
  20. Buffer Spring 1 item
  21. Buffer Tube 7 items
  22. Cam Pin 2 items
  23. Castle Nut / End Plate 2 items
  24. Charging Handle 9 items
  25. Compensator 9 items
  26. Dust Cover 3 items
  27. End Cap 2 items
  28. End Plate 4 items
  29. Firing Pin 3 items
  30. Flash Hider 5 items
  31. Forearm Accesory 5 items
  32. Forward Assist 4 items
  33. Gas Block 20 items
  34. Gas Tube 1 item
  35. Grip Accessory 1 item
  36. Grip Module 1 item
  37. Gunsmithing Tool 1 item
  38. Handguard 3 items
  39. Handstop 12 items
  40. Lower Parts Kit 8 items
  41. Magazine Catch 2 items
  42. Magazine Release 8 items
  43. Magwell 3 items
  44. Muzzle Brake 32 items
  45. Muzzle Device Accessory 6 items
  46. Patch 1 item
  47. Pistol Grip 13 items
  48. Port Door Rod 4 items
  49. Rail Adapter 2 items
  50. Rail Cover 2 items
  51. Rail Panel 2 items
  52. Rail Section 1 item
  53. Recoil Spring 1 item
  54. Retainer Pin 4 items
  55. Safety Selector 26 items
  56. Shim Set 3 items
  57. Sight Post 2 items
  58. Sling Mount 2 items
  59. Spring 1 item
  60. Stock 3 items
  61. Stock Adapter 5 items
  62. Take Down / Pivot Pins 8 items
  63. Trigger 7 items
  64. Trigger / Hammer Pins 1 item
  65. Trigger Guard 3 items
  66. Trigger Spring 1 item
  67. Upper Parts Kit 1 item
  68. Vertical Grip 11 items
Rail Length
  1. 10" 6 items
  2. 12" 7 items
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 13 items
Thread Pitch
  1. 1/2x28 (9mm) 8 items
  2. 1/2x28 (.22 cal) 24 items
  3. 5/8x24 (.30 cal) 10 items
  4. 5/8x32 1 item
  5. 11/16x24 1 item
  6. M18x1.5 2 items
  7. M24x1.5 RH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:10 3 items
Stock Status
  1. In stock 10 items
  2. Out of stock 317 items Remove This Item
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