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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 401-416 of 851

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  3. Armaspec Sound Mitigation Buffer Gen 3
    Armaspec Sound Mitigation Buffer Gen 3
    Out of stock
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  4. Faxon Firearms AR-10 Height 3 Screw Gas Block - .875
    Faxon Firearms AR-10 Height 3 Screw Gas Block - .875
    $39.79
    Out of stock
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  6. Geissele Super 7.62 Charging Handle - Black
    Geissele Super 7.62 Charging Handle - Black
    $140.00
    Out of stock
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  9. Maxim Defense SCW Pistol Brace - STD 3.3 oz Black
    Maxim Defense SCW Pistol Brace - STD 3.3 oz Black
    $494.96
    Out of stock
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  10. WOOX Wild Man Chassis - Dark Forest
    WOOX Wild Man Chassis - Dark Forest
    Out of stock
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  11. WMD Guns AR-15 Forward Assist Assembly
    WMD Guns AR-15 Forward Assist Assembly
    Out of stock
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  12. WMD Guns .308 Lower Parts Kit Mod 3 - NiB-X/Nitromet
    WMD Guns .308 Lower Parts Kit Mod 3 - NiB-X/Nitromet
    $95.00
    Out of stock
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  13. Faxon Firearms 458 Socom/450 Bushmaster Bolt - Nitride
    Faxon Firearms 458 Socom/450 Bushmaster Bolt - Nitride
    $78.19
    Out of stock
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  14. Tyrant Designs Mod V2 Pistol Grip
    Tyrant Designs Mod V2 Pistol Grip
    Out of stock
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  15. Griffin Armament EZ Brake .30 - 5/8x24
    Griffin Armament EZ Brake .30 - 5/8x24
    $79.95
    Out of stock
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  16. Sons of Liberty Gun Works Stripped Upper Receiver
    Sons of Liberty Gun Works Stripped Upper Receiver
    $142.50
    Out of stock
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Items 401-416 of 851

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Shopping Options
Barrel Length
  1. 5.25" 1 item
  2. 5.5" 7 items
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.25" 1 item
  7. 7.5" 2 items
  8. 7.94" 1 item
  9. 8" 4 items
  10. 8.3" 3 items
  11. 8.5" 5 items
  12. 9" 4 items
  13. 9.5" 1 item
  14. 9.75" 1 item
  15. 10.3" 3 items
  16. 10.5" 13 items
  17. 10.7" 1 item
  18. 11" 1 item
  19. 11.5" 11 items
  20. 11.85" 2 items
  21. 12" 5 items
  22. 12.5" 7 items
  23. 13" 1 item
  24. 13.7" 4 items
  25. 13.9" 1 item
  26. 14.5" 8 items
  27. 16" 46 items
  28. 16.1" 2 items
  29. 16.3" 1 item
  30. 18" 28 items
  31. 20" 13 items
  32. 22" 14 items
  33. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 7 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 4 items
  2. .223/5.56 7 items
  3. .223 Wylde 17 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 6 items
  7. .308 Win 14 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 2 items
  12. 300 Blackout 29 items
  13. 5.56X45 5 items
  14. 5.56 NATO 77 items
  15. 5.56mm 2 items
  16. 6mm ARC 9 items
  17. 6.5 Creedmoor 7 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 11 items
  20. 7.62mm 3 items
  21. 7.62x39 4 items
  22. 7.62x51 3 items
  23. 8.6 Blackout 7 items
  24. 9mm 25 items
Category
  1. Receiver Parts 174 items
  2. Parts & Kits 105 items
  3. Barrels 121 items
  4. Buffer Systems 30 items
  5. Trigger Parts 48 items
  6. Gas Systems 25 items
  7. Muzzle Devices 81 items
  8. Bolt Parts 50 items
  9. Grips 49 items
  10. Charging Handles 34 items
  11. Rifle Handguards 81 items
  12. Stocks & Braces 53 items
  13. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 2 items
  2. AR-15 11 items
  3. Carbine 1 item
  4. Curved 4 items
  5. Flat 5 items
  6. Gen 1-3 1 item
  7. GEN 2 1 item
  8. Left 1 item
  9. Left Hand 1 item
  10. M-LOK 6 items
  11. Rifle 1 item
  12. Straight 1 item
  13. .625 DIA 3 items
  14. .750 DIA 5 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 6 items
  3. Black Nitride 2 items
  4. Cerakote 7 items
  5. Chrome 1 item
  6. DLC 3 items
  7. FDE 1 item
  8. Melonite 2 items
  9. NiB-X 1 item
  10. Nickel Boron 4 items
  11. Nitride 38 items
  12. Nitromet 1 item
  13. Phosphate 3 items
  14. Polished 13 items
  15. Red 1 item
  16. Satin 27 items
  17. Anodize 27 items
  18. Clear Hard Anodize 1 item
  19. Quench Polish Quench (QPQ) 4 items
  20. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 7 items
  2. .750" 89 items
  3. .875" 11 items
  4. .936" 1 item
Gas System Length
  1. Blowback 9 items
  2. Pistol 15 items
  3. Carbine 23 items
  4. Mid 39 items
  5. Intermediate 10 items
  6. Rifle 23 items
  7. Rifle +1 3 items
  8. Rifle +2 4 items
Height
  1. Absolute Co-Witness 3 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 2 items
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.45" 1 item
  7. 1.5" 1 item
  8. 1.55" 1 item
Manufacturer
  1. A3 Tactical 10 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 53 items
  5. Aeroknox 8 items
  6. ALG Defense 1 item
  7. Angstadt Arms 9 items
  8. Apex Tactical Specialties 1 item
  9. Armaspec 9 items
  10. Arms Republic 1 item
  11. Ascalon Arms 5 items
  12. Brügger & Thomet (B&T) 3 items
  13. B5 Systems 5 items
  14. Ballistic Advantage 29 items
  15. Battle Arms Development 37 items
  16. Blitzkrieg Components 3 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 34 items
  19. Centurion Arms 3 items
  20. Chisel Machining 2 items
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 5 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 4 items
  25. Drew Meyers Defense 2 items
  26. Driven Arms Co. 1 item
  27. Elftmann Tactical 3 items
  28. Ergo Grips 7 items
  29. F5 MFG 10 items
  30. Faxon Firearms 39 items
  31. Ferfrans 1 item
  32. Flatline Fiber Co 1 item
  33. Fortis MFG 11 items
  34. Forward Controls Design 12 items
  35. Gear Head Works 3 items
  36. Geissele 13 items
  37. Grey Birch MFG 1 item
  38. Griffin Armament 15 items
  39. HB Industries 9 items
  40. HERA ARMS 6 items
  41. Heresy Design 1 item
  42. Hiperfire 14 items
  43. HUXWRX 4 items
  44. Icon Defense 1 item
  45. James Madison Tactical (JMT) 1 item
  46. JK Armament 3 items
  47. JMAC Customs 9 items
  48. JP Enterprises Inc 9 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 15 items
  51. KNS Precision 5 items
  52. Kalashnikov USA 2 items
  53. Kratos Design Group 1 item
  54. Krebs Customs 4 items
  55. KynSHOT 3 items
  56. Lantac 13 items
  57. Law Tactical 2 items
  58. Lee Sporting 4 items
  59. Leitner-Wise 1 item
  60. Lewis Machine & Tool (LMT) 13 items
  61. Mad Pig 2 items
  62. Mag-Pod 1 item
  63. Magpul Industries 18 items
  64. Maxim Defense 7 items
  65. Midwest Industries 20 items
  66. NEMO Arms 4 items
  67. Next Level Armament 10 items
  68. Noveske 30 items
  69. Obsidian Arms 1 item
  70. Patriot Ordnance Factory (POF) 5 items
  71. Precision Armament 7 items
  72. Primary Weapon Systems 8 items
  73. Q, LLC 12 items
  74. R&D Precision 1 item
  75. Radian Weapons 7 items
  76. Raidworx 1 item
  77. Rainier Arms, LLC 65 items
  78. Rainier Industries 1 item
  79. Reptilia Corp 5 items
  80. Rise Armament 4 items
  81. RS Regulate 1 item
  82. SB Tactical 3 items
  83. Sharps Bros 7 items
  84. Sig Sauer 7 items
  85. Silencerco 9 items
  86. Sionics Weapon Systems 5 items
  87. SLR Rifleworks 4 items
  88. Sons of Liberty Gun Works 12 items
  89. Spinta Precision 3 items
  90. Springer Precision 1 item
  91. Stag Arms 1 item
  92. Strike Industries 2 items
  93. Surefire 5 items
  94. Taran Tactical Innovations 2 items
  95. Timney Triggers 4 items
  96. Triggertech 4 items
  97. Troy Industries 7 items
  98. TruCalibre 4 items
  99. Tyrant Designs 5 items
  100. V Seven Weapon Systems 39 items
  101. VKTR Industries 5 items
  102. VLTOR 6 items
  103. WMD Guns 7 items
  104. WOOX 1 item
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 10 items
  3. FNH Scar 2 items
  4. H&K MP5K 1 item
  5. IWI Galil 1 item
  6. Remington 700 2 items
  7. Sig MCX 5 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 74 items
  3. Picatinny 26 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 7 items
  3. AR-10 23 items
  4. AR-15 120 items
  5. FN 509 1 item
  6. SRS-C 3.3 oz. 1 item
  7. SRS-H 3.8 oz. 1 item
  8. SRS-H2 4.7 oz. 1 item
  9. SRS-H3 5.6 oz. 1 item
  10. SRS-BB 5.7 oz. 1 item
  11. SRS-9mm 6.4 oz. 1 item
  12. SRS-AR10 5.7 oz. 1 item
  13. Remington 700 Short Action BDL 1 item
  14. Remington 700 Long Action BDL 1 item
  15. Sauer 100 1 item
  16. WA 1 item
  17. KS 1 item
  18. CZ 13 items
  19. FNH 1 item
  20. Glock 3 items
  21. Heckler & Koch 1 item
  22. Small Lever 1 item
  23. Large Lever 2 items
  24. AKM 1 item
  25. Green Laser 1 item
  26. Adjustable 4 items
  27. Non-Adjustable 14 items
  28. MCS 2 items
  29. Full Size 2 items
  30. IWI Uzi Pro 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 17 items
  3. AR-15 139 items
  4. AK47/74 4 items
  5. CZ 10 items
  6. FNH 2 items
  7. H&K 2 items
  8. IWI 1 item
  9. Remington 2 items
  10. Remington 700 9 items
  11. Ruger 1 item
  12. Ruger Precision Rifle 1 item
  13. Savage Small Shank 10 items
  14. Sig Sauer 8 items
  15. Sig MPX 1 item
  16. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 825 items
  2. $1,000.00 - $1,999.99 24 items
  3. $2,000.00 - $2,999.99 1 item
  4. $4,000.00 and above 1 item
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/LR308 Barrel 15 items
  7. AR-10 / LR 308 Charging Handle 4 items
  8. AR-10 Complete Upper Receiver 1 item
  9. AR-10 Partial Upper Receiver 1 item
  10. AR-10 Handguard 5 items
  11. AR-10 Receiver Set 4 items
  12. AR-10 Stripped Lower Receiver 3 items
  13. AR-10 Stripped Upper Receiver 3 items
  14. AR-15 Assembled Upper Receiver 3 items
  15. AR-15 Barrel 83 items
  16. AR-15 Charging Handle 16 items
  17. AR-15 Complete Lower Receiver 22 items
  18. AR-15 Complete Upper Receiver 25 items
  19. AR-15 Partial Upper Receiver 23 items
  20. AR-15 Handguard 30 items
  21. AR-15 Receiver Set 9 items
  22. AR-15 Stripped Lower Receiver 27 items
  23. AR-15 Stripped Upper Receiver 22 items
  24. AR-15 Upper Receiver Group 1 item
  25. AR-9 Lower Receiver 4 items
  26. AR-9 Complete Lower Receiver 1 item
  27. AR-9 Receiver Set 1 item
  28. AR-9 Upper Receiver 2 items
  29. Barrel Nut 3 items
  30. Blast Shield 3 items
  31. Bolt 5 items
  32. Bolt-Action Barrel 21 items
  33. Bolt Carrier Group 36 items
  34. Bolt Catch 8 items
  35. Brace 6 items
  36. Brace Strap 1 item
  37. Buffer 10 items
  38. Buffer Kit 6 items
  39. Buffer Spring 2 items
  40. Buffer Tube 10 items
  41. Builders Kit 1 item
  42. Cam Pin 2 items
  43. Castle Nut / End Plate 2 items
  44. Charging Handle 12 items
  45. Chassis 4 items
  46. Compensator 11 items
  47. Complete Upper 9 items
  48. Dust Cover 3 items
  49. End Cap 2 items
  50. End Plate 4 items
  51. Firing Pin 3 items
  52. Flash Hider 14 items
  53. Forearm Accesory 6 items
  54. Forward Assist 4 items
  55. Gas Block 21 items
  56. Gas Tube 1 item
  57. Grip Accessory 1 item
  58. Grip Module 1 item
  59. Gunsmithing Tool 1 item
  60. Handguard 25 items
  61. Handgun 1 item
  62. Handstop 12 items
  63. Iron Sight 1 item
  64. Lower Parts Kit 10 items
  65. Lower Receiver 5 items
  66. Magazine Catch 2 items
  67. Magazine Release 8 items
  68. Magwell 3 items
  69. Muzzle Brake 42 items
  70. Muzzle Device Accessory 12 items
  71. Parts Kit 2 items
  72. Patch 1 item
  73. Pistol Grip 16 items
  74. Piston System 2 items
  75. Port Door Rod 4 items
  76. Rail Adapter 5 items
  77. Rail Cover 2 items
  78. Rail Panel 2 items
  79. Rail Section 2 items
  80. Recoil Spring 1 item
  81. Retainer Pin 4 items
  82. Safety Selector 27 items
  83. Scope Mount 1 item
  84. Shim Set 3 items
  85. Sig MPX Barrel 1 item
  86. Sight Post 2 items
  87. Silent Captured Spring 1 item
  88. Sling Mount 2 items
  89. Spring 1 item
  90. Steyr Aug Barrel 1 item
  91. Stock 30 items
  92. Stock Accessory 5 items
  93. Stock Adapter 8 items
  94. Suppressor 1 item
  95. Take Down / Pivot Pins 8 items
  96. Trigger 38 items
  97. Trigger / Hammer Pins 1 item
  98. Trigger Guard 3 items
  99. Trigger Spring 1 item
  100. Upper Parts Kit 1 item
  101. Vertical Grip 11 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 1 item
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 3 items
  8. 6.91" 1 item
  9. 7" 7 items
  10. 7.2" 1 item
  11. 7.25" 1 item
  12. 7.9" 1 item
  13. 8" 2 items
  14. 8.25" 1 item
  15. 9" 2 items
  16. 9.5" 7 items
  17. 9.55" 1 item
  18. 9.6" 2 items
  19. 9.75" 1 item
  20. 10" 11 items
  21. 10.25" 1 item
  22. 10.5" 4 items
  23. 10.7" 1 item
  24. 10.75" 1 item
  25. 10.8" 1 item
  26. 11" 1 item
  27. 11.1" 1 item
  28. 11.5" 4 items
  29. 11.7" 1 item
  30. 12" 11 items
  31. 12.25" 1 item
  32. 12.4" 1 item
  33. 12.5" 3 items
  34. 12.625" 1 item
  35. 13" 5 items
  36. 13.5" 3 items
  37. 13.625" 1 item
  38. 13.7" 5 items
  39. 13.8" 2 items
  40. 14" 1 item
  41. 15" 28 items
  42. 15.3" 1 item
  43. 15.8" 1 item
  44. 16" 1 item
  45. 16.5" 1 item
  46. 17" 1 item
  47. 18" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 2 items
  6. 9 Slot 15 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 15 items
  4. 1/2x28 (.22 cal) 97 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 77 items
  8. 5/8x32 1 item
  9. 11/16x24 2 items
  10. M14x1 LH 1 item
  11. M18x1.5 3 items
  12. M24x1.5 RH 1 item
Threaded
  1. Yes 26 items
  2. No 2 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 2 items
  3. 1:6 1 item
  4. 1:7 66 items
  5. 1:7.5 14 items
  6. 1:8 30 items
  7. 1:10 25 items
  8. 1:14 1 item
Stock Status
  1. In stock 13 items
  2. Out of stock 838 items Remove This Item
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