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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 145-160 of 212

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  2. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  5. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  6. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
    Out of stock
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  7. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
    Out of stock
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  8. 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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  9. Fortis MFG Shift Fore-End Vertical Grip M-LOK
    Fortis MFG Shift Fore-End Vertical Grip M-LOK
    $56.95
    Out of stock
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  10. Magpul Rail Cover M-LOK Type 1
    Magpul Rail Cover M-LOK Type 1
    Out of stock
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  12. Magpul M-LOK Aluminum Rail Section
    Magpul M-LOK Aluminum Rail Section
    Out of stock
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  13. SLR M-LOK RAIL SECTION
    SLR M-LOK RAIL SECTION
    Out of stock
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  16. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    $1,412.00
    Out of stock
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Items 145-160 of 212

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  1. Mount M-LOK Remove This Item
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Barrel Length
  1. 5" 1 item
  2. 5.5" 5 items
  3. 7.5" 2 items
  4. 8" 1 item
  5. 8.5" 2 items
  6. 10.3" 5 items
  7. 10.5" 7 items
  8. 10.7" 1 item
  9. 11.5" 1 item
  10. 12.5" 1 item
  11. 13.7" 3 items
  12. 14.5" 5 items
  13. 16" 7 items
  14. 17" 1 item
  15. 18" 2 items
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .22 ARC 1 item
  2. .223/5.56 1 item
  3. .223 Wylde 2 items
  4. .30-30 1 item
  5. .308 1 item
  6. 300 Blackout 4 items
  7. 5.56 NATO 20 items
  8. 7.62x39 1 item
  9. 9mm 4 items
Category
  1. Receiver Parts 45 items
  2. Gas Systems 1 item
  3. Grips 61 items
  4. Rifle Handguards 103 items
  5. Stocks & Braces 3 items
Color
Configuration
  1. AR-15 3 items
  2. M-LOK 3 items
Finish
  1. Arid 1 item
  2. Black 1 item
  3. Carbon Fiber 1 item
  4. Cerakote 1 item
  5. FDE 1 item
  6. Phosphate 1 item
  7. Anodize 14 items
Gas Block Diameter
  1. .750" 10 items
Gas System Length
  1. Carbine 6 items
  2. Mid 13 items
  3. Rifle 1 item
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 6 items
  3. 1.31" 1 item
  4. 1.315" 3 items
  5. 1.34" 3 items
  6. 1.39" 1 item
  7. 1.42" 1 item
  8. 1.45" 1 item
  9. 1.54" 1 item
  10. 1.55" 1 item
Manufacturer
  1. A3 Tactical 7 items
  2. Aero Precision 2 items
  3. Aeroknox 3 items
  4. Angstadt Arms 1 item
  5. Arisaka 3 items
  6. B5 Systems 3 items
  7. Battle Arms Development 2 items
  8. Bravo Company MFG (BCM) 12 items
  9. Brigand Arms 1 item
  10. Centurion Arms 1 item
  11. Chisel Machining 1 item
  12. Cobalt Kinetics 1 item
  13. Cross Machine Tool (CMT) 5 items
  14. Daniel Defense 7 items
  15. Drew Meyers Defense 5 items
  16. Driven Arms Co. 2 items
  17. Emissary Development 3 items
  18. Ergo Grips 3 items
  19. F-1 Firearms 1 item
  20. Faxon Firearms 1 item
  21. Fortis MFG 9 items
  22. Forward Controls Design 7 items
  23. Geissele 5 items
  24. Griffin Armament 2 items
  25. HERA ARMS 1 item
  26. Heresy Design 1 item
  27. Icon Defense 1 item
  28. JMAC Customs 12 items
  29. Kinetic Development Group 3 items
  30. Knight’s Armament Company (KAC) 2 items
  31. Kratos Design Group 2 items
  32. Lewis Machine & Tool (LMT) 6 items
  33. Magpul Industries 11 items
  34. Matador Arms 1 item
  35. Maxim Defense 8 items
  36. Midwest Industries 12 items
  37. Next Level Armament 3 items
  38. Noveske 14 items
  39. Quarter Circle 10 2 items
  40. Radian Weapons 2 items
  41. Rainier Arms, LLC 5 items
  42. Rainier Industries 2 items
  43. Rise Armament 2 items
  44. ROAM Rifles 4 items
  45. RogueOps 1 item
  46. RS Regulate 1 item
  47. Sharps Bros 4 items
  48. Sig Sauer 1 item
  49. Sionics Weapon Systems 1 item
  50. SLR Rifleworks 2 items
  51. Sons of Liberty Gun Works 8 items
  52. Strike Industries 1 item
  53. True North Concepts 7 items
  54. Unity Tactical 1 item
  55. V Seven Weapon Systems 2 items
  56. VKTR Industries 1 item
  57. VLTOR 1 item
Model
  1. CZ Scorpion 2 items
  2. Sig MCX 1 item
  3. Sig MPX 1 item
Option
  1. AK-47/74 1 item
  2. AR-10 1 item
  3. AR-15 41 items
  4. Long 1 item
  5. CZ 2 items
  6. Sig Sauer 1 item
  7. Green Laser 1 item
Platform
  1. AR-15 38 items
  2. AK47/74 7 items
  3. CZ 2 items
  4. H&K 1 item
  5. Sig Sauer 2 items
Price
  1. $0.00 - $999.99 193 items
  2. $1,000.00 - $1,999.99 15 items
  3. $2,000.00 and above 4 items
Product Type
  1. Accessory 2 items
  2. Angled Grip 8 items
  3. AR-10 Partial Upper Receiver 1 item
  4. AR-10 Handguard 1 item
  5. AR-15 Complete Upper Receiver 19 items
  6. AR-15 Partial Upper Receiver 14 items
  7. AR-15 Handguard 57 items
  8. AR-9 Upper Receiver 2 items
  9. Cable Clip 1 item
  10. Chassis 4 items
  11. Complete Upper 5 items
  12. Finger Stop 1 item
  13. Forearm Accesory 7 items
  14. Handguard 37 items
  15. Handstop 33 items
  16. Rail Adapter 1 item
  17. Rail Cover 1 item
  18. Rail Panel 2 items
  19. Rail Section 1 item
  20. Sling Mount 2 items
  21. Stock 2 items
  22. Stock Adapter 1 item
  23. Vertical Grip 21 items
Rail Length
  1. 3" 1 item
  2. 3.25" 1 item
  3. 4" 1 item
  4. 4.25" 3 items
  5. 4.5" 2 items
  6. 4.9" 1 item
  7. 5.5" 2 items
  8. 5.99" 1 item
  9. 6.0" 2 items
  10. 6.25" 2 items
  11. 6.375" 1 item
  12. 6.5" 1 item
  13. 6.7" 7 items
  14. 6.75" 2 items
  15. 7" 9 items
  16. 7.2" 2 items
  17. 7.25" 1 item
  18. 7.3" 1 item
  19. 7.5" 2 items
  20. 7.8" 1 item
  21. 8" 2 items
  22. 8.25" 1 item
  23. 8.5" 1 item
  24. 8.6" 1 item
  25. 9" 7 items
  26. 9.15" 2 items
  27. 9.25" 1 item
  28. 9.3" 2 items
  29. 9.5" 16 items
  30. 9.55" 3 items
  31. 9.59" 1 item
  32. 9.6" 5 items
  33. 9.75" 1 item
  34. 10" 7 items
  35. 10.3" 1 item
  36. 10.5" 9 items
  37. 10.64" 2 items
  38. 10.7" 3 items
  39. 10.75" 1 item
  40. 11" 2 items
  41. 11.1" 2 items
  42. 11.5" 4 items
  43. 11.7" 3 items
  44. 11.8" 4 items
  45. 12" 3 items
  46. 12.3" 1 item
  47. 12.4" 3 items
  48. 12.5" 9 items
  49. 13" 12 items
  50. 13.25" 1 item
  51. 13.5" 11 items
  52. 13.625" 1 item
  53. 13.7" 7 items
  54. 13.8" 5 items
  55. 14" 6 items
  56. 14.3" 1 item
  57. 15" 37 items
  58. 15.25" 1 item
  59. 15.3" 6 items
  60. 16" 1 item
  61. 16.3" 1 item
  62. 16.5" 3 items
  63. 17" 2 items
  64. 18" 1 item
Size
  1. 3 Slot 3 items
  2. 5 Slot 3 items
  3. 7 Slot 2 items
  4. 9 Slot 3 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 13 items
  3. 5/8x24 (.30 cal) 2 items
Threaded
  1. Yes 13 items
Twist Rate
  1. 1:7 16 items
  2. 1:8 1 item
  3. 1:10 1 item
Stock Status
  1. In stock 138 items
  2. Out of stock 74 items
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