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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 1-16 of 833

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  1. Rise Armament AR-15 Lower Parts Kit
    Rise Armament AR-15 Lower Parts Kit
    $44.99
    Out of stock
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  4. Aero Precision M5 Atlas R-One M-Lok Handguard - 15"
    Aero Precision M5 Atlas R-One M-Lok Handguard - 15"
    $224.99
    Out of stock
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  9. Milspec/GI A2 Flash Hider - 1/2x28
    Milspec/GI A2 Flash Hider - 1/2x28
    $8.00
    Out of stock
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  11. Aero Precision AR10/AR15 Fix It Kit
    Aero Precision AR10/AR15 Fix It Kit
    $17.99
    Out of stock
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  12. Lantac .223/5.56 E-BCG - TiN
    Lantac .223/5.56 E-BCG - TiN
    $305.99
    Out of stock
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  14. Aero Precision Low Profile Gas Block - .750 Nitride
    Aero Precision Low Profile Gas Block - .750 Nitride
    $35.99
    Out of stock
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  16. Geissele Super 700 Trigger
    Geissele Super 700 Trigger
    $250.00
    Out of stock
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Items 1-16 of 833

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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" 3 items
  15. 10.5" 12 items
  16. 10.7" 1 item
  17. 11" 1 item
  18. 11.5" 9 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" 2 items
  25. 14.5" 9 items
  26. 16" 48 items
  27. 16.1" 2 items
  28. 16.3" 1 item
  29. 18" 23 items
  30. 20" 12 items
  31. 22" 12 items
  32. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 6 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 3 items
  2. .223/5.56 7 items
  3. .223 Wylde 16 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 7 items
  7. .308 Win 12 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 2 items
  12. 300 Blackout 28 items
  13. 5.56X45 6 items
  14. 5.56 NATO 75 items
  15. 5.56mm 3 items
  16. 6mm ARC 6 items
  17. 6.5 Creedmoor 6 items
  18. 6.5 Grendel 2 items
  19. 6MM Creedmoor 10 items
  20. 7.62mm 3 items
  21. 7.62x39 3 items
  22. 7.62x51 2 items
  23. 8.6 Blackout 7 items
  24. 9mm 24 items
Category
  1. Receiver Parts 177 items
  2. Parts & Kits 95 items
  3. Barrels 107 items
  4. Buffer Systems 28 items
  5. Trigger Parts 56 items
  6. Gas Systems 24 items
  7. Muzzle Devices 82 items
  8. Bolt Parts 49 items
  9. Grips 51 items
  10. Charging Handles 32 items
  11. Rifle Handguards 80 items
  12. Stocks & Braces 51 items
  13. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  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 4 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 6 items
  3. Black Nitride 2 items
  4. Cerakote 6 items
  5. Chrome 1 item
  6. DLC 2 items
  7. FDE 1 item
  8. Melonite 2 items
  9. NiB-X 1 item
  10. Nickel Boron 2 items
  11. Nitride 38 items
  12. Nitromet 1 item
  13. Phosphate 3 items
  14. Polished 11 items
  15. Red 1 item
  16. Satin 22 items
  17. Anodize 26 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" 81 items
  3. .875" 8 items
  4. .936" 1 item
Gas System Length
  1. Blowback 8 items
  2. Pistol 15 items
  3. Carbine 19 items
  4. Mid 40 items
  5. Intermediate 9 items
  6. Rifle 19 items
  7. Rifle +1 2 items
  8. Rifle +2 2 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. 1.35" 1 item
  5. 1.4" 1 item
  6. 1.42" 1 item
  7. 1.45" 1 item
  8. 1.5" 1 item
  9. 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 7 items
  11. Ascalon Arms 5 items
  12. Brügger & Thomet (B&T) 3 items
  13. B5 Systems 6 items
  14. Ballistic Advantage 28 items
  15. Battle Arms Development 35 items
  16. Blackout Defense 8 items
  17. Blitzkrieg Components 1 item
  18. Bootleg 2 items
  19. Bravo Company MFG (BCM) 35 items
  20. Centurion Arms 5 items
  21. Chisel Machining 1 item
  22. Cross Machine Tool (CMT) 8 items
  23. Daniel Defense 6 items
  24. Dead Air Armament 2 items
  25. Dead Foot Arms LLC 4 items
  26. DPM Systems Technologies 1 item
  27. Drew Meyers Defense 2 items
  28. Elftmann Tactical 1 item
  29. Ergo Grips 7 items
  30. F5 MFG 10 items
  31. Faxon Firearms 36 items
  32. Ferfrans 1 item
  33. Flatline Fiber Co 1 item
  34. Fortis MFG 14 items
  35. Forward Controls Design 10 items
  36. FosTecH 2 items
  37. Gear Head Works 2 items
  38. Geissele 17 items
  39. Grey Birch MFG 1 item
  40. Griffin Armament 11 items
  41. HB Industries 9 items
  42. HERA ARMS 6 items
  43. Heresy Design 1 item
  44. Hiperfire 12 items
  45. HUXWRX 5 items
  46. Icon Defense 1 item
  47. James Madison Tactical (JMT) 1 item
  48. JK Armament 3 items
  49. JMAC Customs 11 items
  50. JP Enterprises Inc 7 items
  51. Kinetic Development Group 5 items
  52. Knight’s Armament Company (KAC) 14 items
  53. KNS Precision 3 items
  54. Kalashnikov USA 2 items
  55. Krebs Customs 4 items
  56. KynSHOT 3 items
  57. Lantac 11 items
  58. Law Tactical 2 items
  59. Lee Sporting 4 items
  60. Leitner-Wise 1 item
  61. Lewis Machine & Tool (LMT) 15 items
  62. Mad Pig 2 items
  63. Mag-Pod 1 item
  64. Magpul Industries 14 items
  65. Maxim Defense 5 items
  66. Midwest Industries 19 items
  67. NEMO Arms 4 items
  68. Next Level Armament 9 items
  69. Noveske 26 items
  70. Obsidian Arms 1 item
  71. Patriot Ordnance Factory (POF) 4 items
  72. Precision Armament 4 items
  73. Primary Weapon Systems 7 items
  74. Q, LLC 9 items
  75. Radian Weapons 5 items
  76. Raidworx 1 item
  77. Rainier Arms, LLC 59 items
  78. Rainier Industries 1 item
  79. Reptilia Corp 5 items
  80. Rise Armament 5 items
  81. RS Regulate 1 item
  82. SB Tactical 4 items
  83. Sharps Bros 11 items
  84. Sig Sauer 5 items
  85. Silencerco 8 items
  86. Sionics Weapon Systems 5 items
  87. SLR Rifleworks 4 items
  88. Sons of Liberty Gun Works 11 items
  89. Spinta Precision 3 items
  90. Springer Precision 1 item
  91. Stag Arms 1 item
  92. Strike Industries 1 item
  93. Superlative Arms 1 item
  94. Surefire 6 items
  95. Taran Tactical Innovations 2 items
  96. Timney Triggers 5 items
  97. Triggertech 3 items
  98. Troy Industries 7 items
  99. TruCalibre 4 items
  100. True North Concepts 2 items
  101. Tyrant Designs 5 items
  102. V Seven Weapon Systems 38 items
  103. VKTR Industries 5 items
  104. VLTOR 6 items
  105. WMD Guns 7 items
  106. WOOX 1 item
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 9 items
  3. FNH Scar 2 items
  4. IWI Galil 1 item
  5. Remington 700 2 items
  6. Sig MCX 4 items
  7. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 74 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-15 124 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. 9mm 1 item
  19. CZ 13 items
  20. FNH 1 item
  21. Glock 3 items
  22. Heckler & Koch 1 item
  23. Small Lever 1 item
  24. Large Lever 2 items
  25. AKM 1 item
  26. Green Laser 1 item
  27. Adjustable 3 items
  28. Non-Adjustable 13 items
  29. MCS 2 items
  30. Full Size 2 items
  31. IWI Uzi Pro 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 17 items
  3. AR-15 137 items
  4. AK47/74 5 items
  5. CZ 9 items
  6. FNH 2 items
  7. H&K 1 item
  8. IWI 1 item
  9. Remington 2 items
  10. Remington 700 8 items
  11. Ruger 2 items
  12. Ruger Precision Rifle 1 item
  13. Savage Small Shank 9 items
  14. Sig Sauer 6 items
  15. Sig MPX 1 item
  16. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 810 items
  2. $1,000.00 - $1,999.99 22 items
  3. $2,000.00 and above 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 13 items
  6. AR-10 / LR 308 Charging Handle 4 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Partial Upper Receiver 2 items
  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 73 items
  15. AR-15 Charging Handle 15 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 24 items
  18. AR-15 Partial Upper Receiver 27 items
  19. AR-15 Handguard 30 items
  20. AR-15 Receiver Set 10 items
  21. AR-15 Stripped Lower Receiver 26 items
  22. AR-15 Stripped Upper Receiver 22 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 4 items
  31. Bolt-Action Barrel 19 items
  32. Bolt Carrier Group 37 items
  33. Bolt Catch 8 items
  34. Brace 7 items
  35. Brace Strap 1 item
  36. Buffer 9 items
  37. Buffer Kit 7 items
  38. Buffer Spring 3 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 11 items
  44. Chassis 6 items
  45. Compensator 11 items
  46. Complete Upper 9 items
  47. Dust Cover 3 items
  48. End Cap 2 items
  49. End Plate 1 item
  50. Firing Pin 3 items
  51. Flash Hider 15 items
  52. Forearm Accesory 6 items
  53. Forward Assist 4 items
  54. Front Sight 1 item
  55. Gas Block 20 items
  56. Gas Tube 1 item
  57. Grip Accessory 1 item
  58. Grip Module 1 item
  59. Gunsmithing Tool 1 item
  60. Handguard 24 items
  61. Handgun 1 item
  62. Handstop 12 items
  63. Iron Sight 1 item
  64. Lower Parts Kit 10 items
  65. Lower Receiver 4 items
  66. Magazine Catch 2 items
  67. Magazine Release 8 items
  68. Magwell 1 item
  69. Muzzle Brake 42 items
  70. Muzzle Device Accessory 12 items
  71. Parts Kit 2 items
  72. Patch 1 item
  73. Pistol Grip 14 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 2 items
  82. Safety Selector 23 items
  83. Scope Mount 1 item
  84. Shim Set 2 items
  85. Sig MPX Barrel 1 item
  86. Sight Post 1 item
  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 6 items
  93. Take Down / Pivot Pins 9 items
  94. Trigger 45 items
  95. Trigger / Hammer Pins 1 item
  96. Trigger Guard 3 items
  97. Trigger Spring 1 item
  98. Upper Parts Kit 1 item
  99. 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" 8 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. 9.25" 1 item
  17. 9.3" 1 item
  18. 9.5" 7 items
  19. 9.55" 1 item
  20. 9.6" 2 items
  21. 9.75" 1 item
  22. 10" 11 items
  23. 10.25" 1 item
  24. 10.5" 5 items
  25. 10.7" 1 item
  26. 10.75" 1 item
  27. 10.8" 1 item
  28. 11.1" 1 item
  29. 11.5" 3 items
  30. 11.7" 1 item
  31. 12" 12 items
  32. 12.25" 1 item
  33. 12.4" 1 item
  34. 12.5" 3 items
  35. 12.625" 1 item
  36. 12.75" 1 item
  37. 13" 7 items
  38. 13.5" 3 items
  39. 13.625" 1 item
  40. 13.7" 5 items
  41. 13.8" 2 items
  42. 14" 4 items
  43. 15" 31 items
  44. 15.3" 1 item
  45. 15.8" 1 item
  46. 16" 1 item
  47. 16.5" 1 item
  48. 17" 1 item
  49. 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) 96 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 68 items
  8. 5/8x32 1 item
  9. 11/16x24 2 items
  10. M14x1 LH 1 item
  11. M18x1.5 2 items
  12. M24x1.5 RH 2 items
Threaded
  1. Yes 30 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 60 items
  5. 1:7.5 13 items
  6. 1:8 28 items
  7. 1:10 23 items
  8. 1:14 1 item
Stock Status
  1. In stock 8 items
  2. Out of stock 825 items Remove This Item
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