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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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Shopping Options
Barrel Length
  1. 5.25" 1 item
  2. 5.5" 6 items
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.5" 2 items
  7. 7.94" 1 item
  8. 8" 4 items
  9. 8.3" 3 items
  10. 8.5" 5 items
  11. 9" 4 items
  12. 9.5" 1 item
  13. 9.75" 1 item
  14. 10.3" 4 items
  15. 10.5" 12 items
  16. 10.7" 1 item
  17. 11" 1 item
  18. 11.5" 10 items
  19. 11.85" 1 item
  20. 12" 5 items
  21. 12.5" 7 items
  22. 13" 1 item
  23. 13.7" 3 items
  24. 13.9" 1 item
  25. 14.5" 10 items
  26. 16" 47 items
  27. 16.1" 2 items
  28. 16.3" 1 item
  29. 18" 27 items
  30. 20" 12 items
  31. 22" 13 items
  32. 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 15 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 27 items
  13. 5.56X45 5 items
  14. 5.56 NATO 78 items
  15. 5.56mm 3 items
  16. 6mm ARC 6 items
  17. 6.5 Creedmoor 7 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 11 items
  20. 7.62mm 2 items
  21. 7.62x39 3 items
  22. 7.62x51 2 items
  23. 8.6 Blackout 7 items
  24. 9mm 23 items
Category
  1. Receiver Parts 175 items
  2. Parts & Kits 99 items
  3. Barrels 114 items
  4. Buffer Systems 29 items
  5. Trigger Parts 52 items
  6. Gas Systems 25 items
  7. Muzzle Devices 81 items
  8. Bolt Parts 50 items
  9. Grips 53 items
  10. Charging Handles 31 items
  11. Rifle Handguards 82 items
  12. Stocks & Braces 51 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 4 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 4 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 6 items
  3. Black Nitride 2 items
  4. Cerakote 8 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 3 items
  11. Nitride 36 items
  12. Nitromet 1 item
  13. Phosphate 3 items
  14. Polished 13 items
  15. Red 1 item
  16. Satin 25 items
  17. Anodize 24 items
  18. Clear Hard Anodize 1 item
  19. Quench Polish Quench (QPQ) 4 items
  20. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 7 items
  2. .750" 85 items
  3. .875" 10 items
  4. .936" 1 item
Gas System Length
  1. Blowback 8 items
  2. Pistol 14 items
  3. Carbine 21 items
  4. Mid 40 items
  5. Intermediate 10 items
  6. Rifle 21 items
  7. Rifle +1 2 items
  8. Rifle +2 3 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 12 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 52 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 5 items
  11. Ascalon Arms 5 items
  12. Brügger & Thomet (B&T) 3 items
  13. B5 Systems 5 items
  14. Ballistic Advantage 28 items
  15. Battle Arms Development 36 items
  16. Blitzkrieg Components 2 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 36 items
  19. Centurion Arms 5 items
  20. Chisel Machining 2 items
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 6 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 4 items
  25. Drew Meyers Defense 2 items
  26. Driven Arms Co. 2 items
  27. Elftmann Tactical 2 items
  28. Ergo Grips 7 items
  29. F5 MFG 10 items
  30. Faxon Firearms 36 items
  31. Ferfrans 1 item
  32. Flatline Fiber Co 1 item
  33. Fortis MFG 14 items
  34. Forward Controls Design 7 items
  35. Gear Head Works 2 items
  36. Geissele 20 items
  37. Grey Birch MFG 1 item
  38. Griffin Armament 13 items
  39. HB Industries 9 items
  40. HERA ARMS 6 items
  41. Heresy Design 1 item
  42. Hiperfire 13 items
  43. HUXWRX 2 items
  44. Icon Defense 1 item
  45. James Madison Tactical (JMT) 1 item
  46. JK Armament 3 items
  47. JMAC Customs 12 items
  48. JP Enterprises Inc 10 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 14 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 12 items
  57. Law Tactical 2 items
  58. Lee Sporting 4 items
  59. Leitner-Wise 1 item
  60. Lewis Machine & Tool (LMT) 14 items
  61. Mad Pig 2 items
  62. Mag-Pod 1 item
  63. Magpul Industries 16 items
  64. Maxim Defense 6 items
  65. Midwest Industries 20 items
  66. NEMO Arms 4 items
  67. Next Level Armament 10 items
  68. Noveske 29 items
  69. Obsidian Arms 1 item
  70. Patriot Ordnance Factory (POF) 4 items
  71. Precision Armament 7 items
  72. Primary Weapon Systems 7 items
  73. Q, LLC 10 items
  74. Radian Weapons 5 items
  75. Raidworx 1 item
  76. Rainier Arms, LLC 61 items
  77. Reptilia Corp 5 items
  78. Rise Armament 5 items
  79. RS Regulate 1 item
  80. SB Tactical 3 items
  81. Sharps Bros 11 items
  82. Sig Sauer 6 items
  83. Silencerco 8 items
  84. Sionics Weapon Systems 5 items
  85. SLR Rifleworks 4 items
  86. Sons of Liberty Gun Works 12 items
  87. Spinta Precision 3 items
  88. Springer Precision 1 item
  89. Stag Arms 1 item
  90. Strike Industries 1 item
  91. Superlative Arms 1 item
  92. Surefire 5 items
  93. Taran Tactical Innovations 2 items
  94. Timney Triggers 2 items
  95. Triggertech 4 items
  96. Troy Industries 7 items
  97. TruCalibre 4 items
  98. True North Concepts 2 items
  99. Tyrant Designs 5 items
  100. V Seven Weapon Systems 38 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 9 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 4 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 80 items
  3. Picatinny 30 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 5 items
  3. AR-10 21 items
  4. AR-15 118 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 13 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-15 134 items
  4. AK47/74 4 items
  5. CZ 9 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 2 items
  12. Ruger Precision Rifle 1 item
  13. Savage Small Shank 10 items
  14. Sig Sauer 7 items
  15. Sig MPX 1 item
  16. Steyr Aug 1 item
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/LR308 Barrel 15 items
  6. AR-10 / LR 308 Charging Handle 4 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Partial Upper Receiver 1 item
  9. AR-10 Handguard 5 items
  10. AR-10 Receiver Set 3 items
  11. AR-10 Stripped Lower Receiver 3 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 3 items
  14. AR-15 Barrel 76 items
  15. AR-15 Charging Handle 13 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 24 items
  18. AR-15 Partial Upper Receiver 26 items
  19. AR-15 Handguard 31 items
  20. AR-15 Receiver Set 10 items
  21. AR-15 Stripped Lower Receiver 26 items
  22. AR-15 Stripped Upper Receiver 21 items
  23. AR-15 Upper Receiver Group 1 item
  24. AR-9 Lower Receiver 3 items
  25. AR-9 Complete Lower Receiver 1 item
  26. AR-9 Receiver Set 1 item
  27. AR-9 Upper Receiver 3 items
  28. Barrel Nut 3 items
  29. Blast Shield 3 items
  30. Bolt 5 items
  31. Bolt-Action Barrel 21 items
  32. Bolt Carrier Group 36 items
  33. Bolt Catch 8 items
  34. Brace 6 items
  35. Brace Strap 1 item
  36. Buffer 9 items
  37. Buffer Kit 7 items
  38. Buffer Spring 4 items
  39. Buffer Tube 9 items
  40. Builders Kit 1 item
  41. Cam Pin 2 items
  42. Castle Nut / End Plate 2 items
  43. Charging Handle 12 items
  44. Chassis 7 items
  45. Compensator 10 items
  46. Complete Upper 8 items
  47. Dust Cover 3 items
  48. End Cap 2 items
  49. End Plate 2 items
  50. Firing Pin 3 items
  51. Flash Hider 12 items
  52. Forearm Accesory 6 items
  53. Forward Assist 3 items
  54. Front Sight 1 item
  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 14 items
  63. Iron Sight 1 item
  64. Lower Parts Kit 11 items
  65. Lower Receiver 4 items
  66. Magazine Catch 2 items
  67. Magazine Release 8 items
  68. Magwell 2 items
  69. Muzzle Brake 44 items
  70. Muzzle Device Accessory 13 items
  71. Parts Kit 3 items
  72. Patch 1 item
  73. Pistol Grip 15 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 3 items
  79. Rail Section 2 items
  80. Recoil Spring 1 item
  81. Retainer Pin 3 items
  82. Safety Selector 24 items
  83. Scope Mount 1 item
  84. Shim Set 2 items
  85. Sig MPX Barrel 1 item
  86. Sight Post 2 items
  87. Sling Mount 2 items
  88. Spring 1 item
  89. Steyr Aug Barrel 1 item
  90. Stock 29 items
  91. Stock Accessory 5 items
  92. Stock Adapter 7 items
  93. Suppressor 1 item
  94. Take Down / Pivot Pins 8 items
  95. Trigger 40 items
  96. Trigger / Hammer Pins 2 items
  97. Trigger Guard 3 items
  98. Trigger Spring 1 item
  99. Upper Parts Kit 1 item
  100. Vertical Grip 12 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" 3 items
  16. 9.3" 1 item
  17. 9.5" 7 items
  18. 9.55" 1 item
  19. 9.6" 2 items
  20. 9.75" 1 item
  21. 10" 11 items
  22. 10.25" 1 item
  23. 10.5" 4 items
  24. 10.7" 1 item
  25. 10.75" 1 item
  26. 10.8" 1 item
  27. 11.1" 1 item
  28. 11.5" 4 items
  29. 11.7" 1 item
  30. 12" 13 items
  31. 12.25" 1 item
  32. 12.4" 1 item
  33. 12.5" 3 items
  34. 12.625" 1 item
  35. 13" 6 items
  36. 13.5" 4 items
  37. 13.625" 1 item
  38. 13.7" 5 items
  39. 13.8" 2 items
  40. 14" 4 items
  41. 15" 29 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 2 items
  3. 1/2x28 (9mm) 13 items
  4. 1/2x28 (.22 cal) 94 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 70 items
  8. 5/8x32 1 item
  9. 11/16x24 2 items
  10. M14x1 LH 2 items
  11. M18x1.5 3 items
  12. M24x1.5 RH 2 items
Threaded
  1. Yes 27 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 64 items
  5. 1:7.5 13 items
  6. 1:8 28 items
  7. 1:10 24 items
  8. 1:14 1 item
Stock Status
  1. In stock 23 items
  2. Out of stock 820 items Remove This Item
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