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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. ERGO Enhanced SureGrip
    ERGO Enhanced SureGrip
    Out of stock
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  2. Battle Arms Development RACK AR-15 Ambi Charging Handle
    Battle Arms Development RACK AR-15 Ambi Charging Handle
    $79.99
    Out of stock
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  3. Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    $19.95
    Out of stock
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  4. Brügger & Thomet (B&T) APC9 / APC45 Tailhook Adaptor
    Brügger & Thomet (B&T) APC9 / APC45 Tailhook Adaptor
    $89.00
    Out of stock
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  5. Blitzkrieg Components PCC Buffer Weight 2.6 oz
    Blitzkrieg Components PCC Buffer Weight 2.6 oz
    $20.99
    Out of stock
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  6. Rainier Arms Ambidextrous (50 & 90 Degree) MOD 2 Safety Selector Switch
    Rainier Arms Ambidextrous (50 & 90 Degree) MOD 2 Safety Selector Switch
    Out of stock
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  7. Armaspec SMB - Sound Mitigation Buffer - H Buffer
    Armaspec SMB - Sound Mitigation Buffer - H Buffer
    $44.99
    Out of stock
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  8. AR15 Detent Takedown Spring
    AR15 Detent Takedown Spring
    $1.00
    Out of stock
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  9. AR15 Trigger Spring Kit
    AR15 Trigger Spring Kit
    $3.50
    Out of stock
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  10. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
    Out of stock
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  11. VLTOR Flash Hider - VC:301
    VLTOR Flash Hider - VC:301
    $59.36
    Out of stock
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  12. Young Mfg Aluminum Railed Gas Block - .750
    Young Mfg Aluminum Railed Gas Block - .750
    $39.00
    Out of stock
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  13. NorthTech Defense Titanium Forward Assist
    NorthTech Defense Titanium Forward Assist
    $47.45
    Out of stock
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  14. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  15. JP Enterprises .936 Adjustable Bull Barrel Gas Block
    JP Enterprises .936 Adjustable Bull Barrel Gas Block
    $75.95
    Out of stock
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  16. Magpul Enhanced Trigger Guard - AR15/M4
    Magpul Enhanced Trigger Guard - AR15/M4
    $21.80
    Out of stock
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Items 97-112 of 246

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  3. 18" 4 items
Caliber
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  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 1 item
  7. 5.56 NATO 2 items
  8. 5.56mm 1 item
  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
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  13. 9mm 5 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 67 items
  3. Rifle Barrels 1 item
  4. Buffer Systems 15 items
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  6. Gas Systems 18 items
  7. Muzzle Devices 37 items
  8. Bolt Parts 6 items
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  2. Advanced Armament Company (AAC) 1 item
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  5. ALG Defense 1 item
  6. Angstadt Arms 3 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 8 items
  9. Arms Republic 4 items
  10. Ascalon Arms 3 items
  11. Brügger & Thomet (B&T) 1 item
  12. Ballistic Advantage 5 items
  13. Battle Arms Development 25 items
  14. Blackout Defense 1 item
  15. Blitzkrieg Components 1 item
  16. Bravo Company MFG (BCM) 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. 3 items
  21. Elftmann Tactical 1 item
  22. Emissary Development 2 items
  23. Ergo Grips 7 items
  24. Faxon Firearms 5 items
  25. Fortis MFG 3 items
  26. Forward Controls Design 4 items
  27. Geissele 4 items
  28. Griffin Armament 7 items
  29. HB Industries 3 items
  30. HERA ARMS 4 items
  31. Hiperfire 3 items
  32. James Madison Tactical (JMT) 1 item
  33. JK Armament 1 item
  34. JMAC Customs 2 items
  35. JP Enterprises Inc 1 item
  36. Kinetic Development Group 4 items
  37. Knight’s Armament Company (KAC) 2 items
  38. KNS Precision 1 item
  39. Kalashnikov USA 1 item
  40. Krebs Customs 2 items
  41. Lantac 3 items
  42. Mad Pig 1 item
  43. Magpul Industries 10 items
  44. Midwest Industries 1 item
  45. NEMO Arms 1 item
  46. Next Level Armament 1 item
  47. Noveske 7 items
  48. Obsidian Arms 1 item
  49. Precision Armament 2 items
  50. Primary Weapon Systems 2 items
  51. Q, LLC 3 items
  52. Radian Weapons 3 items
  53. Rainier Arms, LLC 3 items
  54. Rainier Industries 2 items
  55. RS Regulate 1 item
  56. SB Tactical 1 item
  57. Sharps Bros 1 item
  58. Sig Sauer 1 item
  59. Silencerco 7 items
  60. Sionics Weapon Systems 1 item
  61. SLR Rifleworks 1 item
  62. Sons of Liberty Gun Works 1 item
  63. Sprinco (Tactical Springs) 2 items
  64. Springer Precision 1 item
  65. Strike Industries 1 item
  66. Surefire 2 items
  67. Taran Tactical Innovations 1 item
  68. Troy Industries 1 item
  69. TruCalibre 3 items
  70. V Seven Weapon Systems 13 items
  71. VLTOR 2 items
  72. WMD Guns 2 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 4 items
  3. Sig MPX 1 item
Mount
  1. KeyMod 4 items
  2. M-LOK 24 items
  3. Picatinny 8 items
Option
  1. AK-47/74 3 items
  2. AR-10 4 items
  3. AR-15 29 items
  4. Orange - Extra Extra Power 1 item
  5. SRS-C 3.3 oz. 1 item
  6. SRS-H 3.8 oz. 1 item
  7. SRS-H2 4.7 oz. 1 item
  8. SRS-H3 5.6 oz. 1 item
  9. SRS-BB 5.7 oz. 1 item
  10. SRS-9mm 6.4 oz. 1 item
  11. SRS-AR10 5.7 oz. 1 item
  12. CZ 9 items
  13. Small Lever 1 item
  14. Large Lever 2 items
  15. Adjustable 3 items
  16. Non-Adjustable 10 items
Platform
  1. AR-15 4 items
  2. CZ-USA 4 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 9 items
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  5. $40.00 - $49.99 22 items
  6. $50.00 - $59.99 20 items
  7. $60.00 - $69.99 19 items
  8. $70.00 - $79.99 34 items
  9. $80.00 - $89.99 21 items
  10. $90.00 and above 24 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 4 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 12 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 1 item
  12. Blast Shield 1 item
  13. Bolt 2 items
  14. Bolt Catch 5 items
  15. Brace 1 item
  16. Buffer 4 items
  17. Buffer Kit 2 items
  18. Buffer Tube 8 items
  19. Cam Pin 1 item
  20. Castle Nut / End Plate 1 item
  21. Charging Handle 7 items
  22. Compensator 5 items
  23. Dust Cover 2 items
  24. End Cap 2 items
  25. End Plate 2 items
  26. Firing Pin 3 items
  27. Flash Hider 8 items
  28. Forearm Accesory 4 items
  29. Forward Assist 1 item
  30. Gas Block 15 items
  31. Gas Tube 2 items
  32. Grip Module 1 item
  33. Gunsmithing Tool 1 item
  34. Handguard 2 items
  35. Handstop 15 items
  36. Lower Parts Kit 7 items
  37. Magazine Catch 2 items
  38. Magazine Release 6 items
  39. Magwell 1 item
  40. Muzzle Brake 21 items
  41. Muzzle Device Accessory 2 items
  42. Parts Kit 1 item
  43. Patch 1 item
  44. Pistol Grip 8 items
  45. Port Door 1 item
  46. Port Door Rod 4 items
  47. Rail Adapter 1 item
  48. Rail Panel 3 items
  49. Rail Section 1 item
  50. Recoil Spring 1 item
  51. Retainer Pin 1 item
  52. Safety Selector 14 items
  53. Shim Set 1 item
  54. Sling Mount 2 items
  55. Spring 1 item
  56. Stock 3 items
  57. Stock Adapter 3 items
  58. Take Down / Pivot Pins 6 items
  59. Trigger 6 items
  60. Trigger / Hammer Pins 1 item
  61. Trigger Guard 3 items
  62. Trigger Spring 1 item
  63. Upper Parts Kit 1 item
  64. Vertical Grip 6 items
  65. Weight 1 item
Rail Length
  1. 10" 4 items
  2. 12" 4 items
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 8 items
Thread Pitch
  1. 1/2x28 20 items
  2. 5/8x24 7 items
  3. 5/8x32 1 item
  4. 11/16x24 1 item
  5. M24x1.5 RH 1 item
Threaded
  1. Yes 2 items
Stock Status
  1. Out of stock 246 items Remove This Item
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