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raineirarms

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. Armaspec AR Stainless Steel Anti Walk Pins
    Armaspec AR Stainless Steel Anti Walk Pins
    $10.79
    Out of stock
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  2. 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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  4. Armaspec AR-15 Victory Charging Handle - Black
    Armaspec AR-15 Victory Charging Handle - Black
    $71.99
    Out of stock
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  5. 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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  7. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  9. Griffin Armament EZ Brake .30Cal - 1/2x28
    Griffin Armament EZ Brake .30Cal - 1/2x28
    $79.95
    Out of stock
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  10. Midwest Industries Marlin 336 Handguard Adaptor
    Midwest Industries Marlin 336 Handguard Adaptor
    $36.95
    Out of stock
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  11. Ergo Suregrip Tactical Deluxe with Palm Shelf
    Ergo Suregrip Tactical Deluxe with Palm Shelf
    $51.99
    Out of stock
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  13. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
    Out of stock
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  14. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
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  15. Magpul MOE K2-XL Grip
    Magpul MOE K2-XL Grip
    Out of stock
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  16. Noveske Lo Pro Gas Block .625
    Noveske Lo Pro Gas Block .625
    $58.90
    Out of stock
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Items 33-48 of 283

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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 16" 6 items
  4. 18" 4 items
Caliber
  1. .223/5.56 2 items
  2. .30 Cal 3 items
  3. .308 1 item
  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 1 item
  7. 5.56 NATO 3 items
  8. 5.56mm 1 item
  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
  11. 7.62x51 1 item
  12. 8.6 Blackout 2 items
  13. 9mm 7 items
Category
  1. Receiver Parts 6 items
  2. Parts & Kits 78 items
  3. Barrels 2 items
  4. Buffer Systems 22 items
  5. Trigger Parts 11 items
  6. Gas Systems 23 items
  7. Muzzle Devices 41 items
  8. Bolt Parts 5 items
  9. Grips 41 items
  10. Charging Handles 22 items
  11. Rifle Handguards 17 items
  12. Stocks & Braces 11 items
  13. MILSPEC Parts 4 items
Color
Configuration
  1. AR-10 2 items
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  6. .625 DIA 3 items
  7. .750 DIA 5 items
  8. .936 DIA 1 item
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  6. Nitride 5 items
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  8. Anodize 9 items
  9. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 2 items
  2. .750" 9 items
  3. .875" 1 item
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  1. Blowback 2 items
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  3. Carbine 1 item
  4. Mid 7 items
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Inside Diameter
  1. 1.35" 1 item
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  1. A3 Tactical 8 items
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  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 12 items
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  6. Angstadt Arms 3 items
  7. Apex Tactical Specialties 1 item
  8. Arisaka 3 items
  9. Armaspec 9 items
  10. Arms Republic 4 items
  11. Ascalon Arms 3 items
  12. Brügger & Thomet (B&T) 1 item
  13. B5 Systems 1 item
  14. Ballistic Advantage 5 items
  15. Battle Arms Development 17 items
  16. Blackout Defense 1 item
  17. Blitzkrieg Components 3 items
  18. Bravo Company MFG (BCM) 4 items
  19. Cross Machine Tool (CMT) 2 items
  20. Dead Air Armament 1 item
  21. Drew Meyers Defense 1 item
  22. Elftmann Tactical 1 item
  23. Emissary Development 3 items
  24. Ergo Grips 7 items
  25. Faxon Firearms 8 items
  26. Flatline Fiber Co 1 item
  27. Fortis MFG 3 items
  28. Forward Controls Design 7 items
  29. Geissele 8 items
  30. Griffin Armament 9 items
  31. HB Industries 3 items
  32. HERA ARMS 2 items
  33. Hiperfire 2 items
  34. James Madison Tactical (JMT) 1 item
  35. JK Armament 2 items
  36. JMAC Customs 3 items
  37. JP Enterprises Inc 3 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. Krebs Customs 3 items
  43. Lantac 3 items
  44. Leitner-Wise 1 item
  45. Mad Pig 1 item
  46. Mag-Pod 1 item
  47. Magpul Industries 8 items
  48. Midwest Industries 1 item
  49. NEMO Arms 2 items
  50. Next Level Armament 5 items
  51. Noveske 9 items
  52. Obsidian Arms 1 item
  53. Precision Armament 3 items
  54. Primary Weapon Systems 1 item
  55. Q, LLC 4 items
  56. Radian Weapons 4 items
  57. Rainier Arms, LLC 1 item
  58. Rehv Arms 1 item
  59. Reptilia Corp 1 item
  60. RS Regulate 1 item
  61. SB Tactical 2 items
  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 1 item
  67. Spinta Precision 1 item
  68. Springer Precision 1 item
  69. Superlative Arms 1 item
  70. Surefire 2 items
  71. Taran Tactical Innovations 2 items
  72. Timney Triggers 1 item
  73. Troy Industries 1 item
  74. TruCalibre 3 items
  75. True North Concepts 2 items
  76. Tyrant Designs 1 item
  77. V Seven Weapon Systems 21 items
  78. VLTOR 4 items
  79. WMD Guns 3 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 4 items
  3. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 28 items
  3. Picatinny 15 items
Option
  1. AK-47/74 2 items
  2. AR-10 3 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 9 items
  12. Small Lever 1 item
  13. Large Lever 2 items
  14. Green Laser 1 item
  15. Adjustable 4 items
  16. Non-Adjustable 13 items
Platform
  1. AR-15 9 items
  2. CZ 4 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 12 items
  2. $10.00 - $19.99 28 items
  3. $20.00 - $29.99 29 items
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  5. $40.00 - $49.99 25 items
  6. $50.00 - $59.99 35 items
  7. $60.00 - $69.99 22 items
  8. $70.00 - $79.99 35 items
  9. $80.00 - $89.99 24 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 3 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 1 item
  14. Blast Shield 1 item
  15. Bolt 2 items
  16. Bolt Catch 4 items
  17. Brace 2 items
  18. Brace Strap 1 item
  19. Buffer 8 items
  20. Buffer Kit 3 items
  21. Buffer Spring 2 items
  22. Buffer Tube 8 items
  23. Castle Nut / End Plate 2 items
  24. Charging Handle 8 items
  25. Compensator 5 items
  26. Dust Cover 2 items
  27. End Cap 2 items
  28. Finger Stop 1 item
  29. Firing Pin 3 items
  30. Flash Hider 6 items
  31. Forearm Accesory 4 items
  32. Forward Assist 4 items
  33. Gas Block 20 items
  34. Gas Tube 2 items
  35. Grip Accessory 1 item
  36. Grip Module 1 item
  37. Gunsmithing Tool 1 item
  38. Handguard 1 item
  39. Handstop 16 items
  40. Lower Parts Kit 6 items
  41. Magazine Catch 1 item
  42. Magazine Release 7 items
  43. Magwell 1 item
  44. Muzzle Brake 26 items
  45. Muzzle Device Accessory 3 items
  46. Patch 1 item
  47. Pistol Grip 8 items
  48. Port Door Rod 4 items
  49. Rail Adapter 2 items
  50. Rail Cover 1 item
  51. Rail Panel 3 items
  52. Rail Section 1 item
  53. Recoil Spring 1 item
  54. Retainer Pin 1 item
  55. Safety Selector 22 items
  56. Shim Set 2 items
  57. Sight Post 2 items
  58. Sling Mount 2 items
  59. Spring 1 item
  60. Stock 2 items
  61. Stock Adapter 6 items
  62. Take Down / Pivot Pins 9 items
  63. Trigger 3 items
  64. Trigger / Hammer Pins 1 item
  65. Trigger Guard 2 items
  66. Trigger Spring 1 item
  67. Upper Parts Kit 1 item
  68. Vertical Grip 9 items
  69. Weight 1 item
Rail Length
  1. 7" 1 item
  2. 9.25" 1 item
  3. 10" 6 items
  4. 12" 4 items
  5. 15" 1 item
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 10 items
Thread Pitch
  1. 1/2x28 (9mm) 6 items
  2. 1/2x28 (.22 cal) 17 items
  3. 5/8x24 (.30 cal) 9 items
  4. 5/8x32 1 item
  5. 11/16x24 1 item
  6. M18x1.5 1 item
  7. M24x1.5 RH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:10 2 items
Stock Status
  1. Out of stock 283 items Remove This Item
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