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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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  3. Arms Republic Grand Power Stribog Rail Extension
    Arms Republic Grand Power Stribog Rail Extension
    $79.99
    Out of stock
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  4. Armaspec AR Stainless Steel Anti Walk Pins
    Armaspec AR Stainless Steel Anti Walk Pins
    $10.79
    Out of stock
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  5. Armaspec SFT 45/90 Degree Ambi Safety Selector - Black
    Armaspec SFT 45/90 Degree Ambi Safety Selector - Black
    $40.49
    Out of stock
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  7. Armaspec AR-15 Victory Charging Handle - Black
    Armaspec AR-15 Victory Charging Handle - Black
    $71.99
    Out of stock
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  8. Battle Arms Development RACK AR-10 Ambi Charging Handle
    Battle Arms Development RACK AR-10 Ambi Charging Handle
    $94.99
    Out of stock
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  10. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  12. Griffin Armament EZ Brake .30Cal - 1/2x28
    Griffin Armament EZ Brake .30Cal - 1/2x28
    $79.95
    Out of stock
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  13. Midwest Industries Marlin 336 Handguard Adaptor
    Midwest Industries Marlin 336 Handguard Adaptor
    $36.95
    Out of stock
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  14. Ergo Suregrip Tactical Deluxe with Palm Shelf
    Ergo Suregrip Tactical Deluxe with Palm Shelf
    $51.99
    Out of stock
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  16. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
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Items 81-96 of 308

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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 16" 8 items
  4. 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 5 items
  8. 5.56mm 2 items
  9. 7.62x39 1 item
  10. 7.62x51 2 items
  11. 8.6 Blackout 2 items
  12. 9mm 7 items
Category
  1. Receiver Parts 6 items
  2. Parts & Kits 90 items
  3. Barrels 2 items
  4. Buffer Systems 14 items
  5. Trigger Parts 16 items
  6. Gas Systems 21 items
  7. Muzzle Devices 52 items
  8. Bolt Parts 7 items
  9. Grips 43 items
  10. Charging Handles 22 items
  11. Rifle Handguards 21 items
  12. Stocks & Braces 9 items
  13. MILSPEC Parts 5 items
Color
Configuration
  1. AR-10 1 item
  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 4 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 6 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 2 items
  2. Pistol 2 items
  3. Mid 6 items
  4. Intermediate 5 items
  5. Rifle 1 item
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.35" 1 item
Manufacturer
  1. A3 Tactical 9 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 5 items
  10. Ascalon Arms 4 items
  11. Brügger & Thomet (B&T) 1 item
  12. B5 Systems 2 items
  13. Ballistic Advantage 5 items
  14. Battle Arms Development 23 items
  15. Blackout Defense 1 item
  16. Blitzkrieg Components 1 item
  17. Bravo Company MFG (BCM) 4 items
  18. Cross Machine Tool (CMT) 2 items
  19. Daniel Defense 1 item
  20. Dead Air Armament 2 items
  21. Drew Meyers Defense 2 items
  22. Elftmann Tactical 1 item
  23. Ergo Grips 7 items
  24. Faxon Firearms 6 items
  25. Flatline Fiber Co 1 item
  26. Fortis MFG 7 items
  27. Forward Controls Design 9 items
  28. Geissele 3 items
  29. Griffin Armament 9 items
  30. HB Industries 6 items
  31. HERA ARMS 4 items
  32. Hiperfire 2 items
  33. James Madison Tactical (JMT) 1 item
  34. JK Armament 3 items
  35. JMAC Customs 5 items
  36. JP Enterprises Inc 1 item
  37. Kinetic Development Group 4 items
  38. Knight’s Armament Company (KAC) 2 items
  39. KNS Precision 2 items
  40. Kalashnikov USA 1 item
  41. Krebs Customs 4 items
  42. Lantac 3 items
  43. Leitner-Wise 1 item
  44. Mad Pig 2 items
  45. Mag-Pod 1 item
  46. Magpul Industries 13 items
  47. Midwest Industries 1 item
  48. NEMO Arms 1 item
  49. Next Level Armament 5 items
  50. Noveske 9 items
  51. Obsidian Arms 1 item
  52. Patriot Ordnance Factory (POF) 3 items
  53. Precision Armament 3 items
  54. Primary Weapon Systems 1 item
  55. Q, LLC 5 items
  56. Radian Weapons 1 item
  57. Rainier Arms, LLC 1 item
  58. Reptilia Corp 1 item
  59. Rise Armament 2 items
  60. RS Regulate 1 item
  61. SB Tactical 1 item
  62. Sig Sauer 1 item
  63. Silencerco 5 items
  64. Sionics Weapon Systems 1 item
  65. SLR Rifleworks 1 item
  66. Sons of Liberty Gun Works 2 items
  67. Spinta Precision 1 item
  68. Springer Precision 1 item
  69. Stag Arms 1 item
  70. Strike Industries 1 item
  71. Superlative Arms 1 item
  72. Surefire 2 items
  73. Taran Tactical Innovations 2 items
  74. Timney Triggers 1 item
  75. Troy Industries 1 item
  76. TruCalibre 4 items
  77. True North Concepts 2 items
  78. Tyrant Designs 1 item
  79. V Seven Weapon Systems 26 items
  80. VLTOR 4 items
  81. WMD Guns 3 items
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 8 items
  3. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 27 items
  3. Picatinny 15 items
Option
  1. AK-47/74 2 items
  2. AR-10 7 items
  3. AR-15 40 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 3 items
  16. Non-Adjustable 13 items
Platform
  1. AR-15 12 items
  2. CZ 8 items
  3. H&K 1 item
  4. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 15 items
  2. $10.00 - $19.99 34 items
  3. $20.00 - $29.99 29 items
  4. $30.00 - $39.99 43 items
  5. $40.00 - $49.99 31 items
  6. $50.00 - $59.99 33 items
  7. $60.00 - $69.99 27 items
  8. $70.00 - $79.99 38 items
  9. $80.00 - $89.99 29 items
  10. $90.00 and above 29 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 6 items
  4. Anti Walk Pins 5 items
  5. AR-10 / LR 308 Charging Handle 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Barrel 2 items
  8. AR-15 Charging Handle 10 items
  9. AR-15 Handguard 1 item
  10. AR-15 Stripped Lower Receiver 2 items
  11. AR-15 Stripped Upper Receiver 2 items
  12. AR-9 Upper Receiver 1 item
  13. Barrel Nut 3 items
  14. Blast Shield 1 item
  15. Bolt 1 item
  16. Bolt Catch 8 items
  17. Brace 1 item
  18. Brace Strap 1 item
  19. Buffer 5 items
  20. Buffer Kit 2 items
  21. Buffer Spring 1 item
  22. Buffer Tube 6 items
  23. Cam Pin 2 items
  24. Castle Nut / End Plate 2 items
  25. Charging Handle 8 items
  26. Compensator 9 items
  27. Dust Cover 3 items
  28. End Cap 2 items
  29. End Plate 1 item
  30. Firing Pin 3 items
  31. Flash Hider 6 items
  32. Forearm Accesory 5 items
  33. Forward Assist 4 items
  34. Front Sight 1 item
  35. Gas Block 19 items
  36. Gas Tube 1 item
  37. Grip Accessory 1 item
  38. Grip Module 1 item
  39. Gunsmithing Tool 1 item
  40. Handguard 3 items
  41. Handstop 12 items
  42. Lower Parts Kit 7 items
  43. Magazine Catch 2 items
  44. Magazine Release 8 items
  45. Magwell 1 item
  46. Muzzle Brake 30 items
  47. Muzzle Device Accessory 6 items
  48. Parts Kit 1 item
  49. Patch 1 item
  50. Pistol Grip 11 items
  51. Port Door Rod 4 items
  52. Rail Adapter 2 items
  53. Rail Cover 2 items
  54. Rail Panel 3 items
  55. Rail Section 1 item
  56. Recoil Spring 1 item
  57. Retainer Pin 2 items
  58. Safety Selector 22 items
  59. Shim Set 2 items
  60. Sight Post 1 item
  61. Sling Mount 2 items
  62. Spring 1 item
  63. Stock 3 items
  64. Stock Adapter 3 items
  65. Take Down / Pivot Pins 9 items
  66. Trigger 5 items
  67. Trigger / Hammer Pins 1 item
  68. Trigger Guard 3 items
  69. Trigger Spring 1 item
  70. Upper Parts Kit 2 items
  71. Vertical Grip 12 items
Rail Length
  1. 7" 1 item
  2. 9.25" 1 item
  3. 10" 6 items
  4. 12" 8 items
  5. 15" 1 item
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 13 items
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 (9mm) 6 items
  3. 1/2x28 (.22 cal) 24 items
  4. 5/8x24 (.30 cal) 10 items
  5. 5/8x32 1 item
  6. 11/16x24 1 item
  7. M18x1.5 1 item
  8. M24x1.5 RH 1 item
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:10 2 items
Stock Status
  1. In stock 2 items
  2. Out of stock 306 items Remove This Item
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