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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 529-544 of 853

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  1. Icon Defense AR-15 Forged Lower Receiver - Black
    Icon Defense AR-15 Forged Lower Receiver - Black
    $123.99
    Out of stock
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  4. Ascalon Arms CZ Scorpion EVO 3/3+ Receiver Shim
    Ascalon Arms CZ Scorpion EVO 3/3+ Receiver Shim
    $17.40
    Out of stock
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  5. Ascalon Arms CZ Scorpion EVO 3/3+ Trigger Spring Kit
    Ascalon Arms CZ Scorpion EVO 3/3+ Trigger Spring Kit
    $22.00
    Out of stock
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  8. Strike Industries AR Pistol Grip Adapter for CZ Scorpion
    Strike Industries AR Pistol Grip Adapter for CZ Scorpion
    Special Price $57.92 Regular Price $71.95
    Out of stock
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  14. Midwest Industries Alpha Series Folding Stock
    Midwest Industries Alpha Series Folding Stock
    $274.95
    Out of stock
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  15. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  16. Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
    Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
    Out of stock
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Items 529-544 of 853

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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" 45 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 6 items
  3. .223 Wylde 17 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 5 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 4 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 173 items
  2. Parts & Kits 101 items
  3. Barrels 121 items
  4. Buffer Systems 32 items
  5. Trigger Parts 47 items
  6. Gas Systems 25 items
  7. Muzzle Devices 84 items
  8. Bolt Parts 48 items
  9. Grips 49 items
  10. Charging Handles 34 items
  11. Rifle Handguards 82 items
  12. Stocks & Braces 57 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 3 items
  5. Flat 3 items
  6. Gen 1-3 1 item
  7. GEN 2 1 item
  8. Left 1 item
  9. Left Hand 1 item
  10. M-LOK 5 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 7 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 2 items
  13. Phosphate 3 items
  14. Polished 13 items
  15. Red 1 item
  16. Satin 27 items
  17. Anodize 26 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 14 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 2 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 11 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 36 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 3 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. Form Rifle 1 item
  34. Fortis MFG 11 items
  35. Forward Controls Design 8 items
  36. Gear Head Works 3 items
  37. Geissele 12 items
  38. Grey Birch MFG 1 item
  39. Griffin Armament 16 items
  40. HB Industries 9 items
  41. HERA ARMS 8 items
  42. Heresy Design 1 item
  43. Hiperfire 14 items
  44. HUXWRX 5 items
  45. Icon Defense 1 item
  46. James Madison Tactical (JMT) 1 item
  47. JK Armament 3 items
  48. JMAC Customs 12 items
  49. JP Enterprises Inc 11 items
  50. Kinetic Development Group 5 items
  51. Knight’s Armament Company (KAC) 15 items
  52. KNS Precision 5 items
  53. Kalashnikov USA 2 items
  54. Kratos Design Group 1 item
  55. Krebs Customs 4 items
  56. KynSHOT 3 items
  57. Lantac 13 items
  58. Law Tactical 2 items
  59. Lee Sporting 4 items
  60. Leitner-Wise 1 item
  61. Lewis Machine & Tool (LMT) 13 items
  62. Mad Pig 2 items
  63. Mag-Pod 1 item
  64. Magpul Industries 18 items
  65. Maxim Defense 7 items
  66. Midwest Industries 20 items
  67. NEMO Arms 4 items
  68. Next Level Armament 10 items
  69. Noveske 30 items
  70. Patriot Ordnance Factory (POF) 1 item
  71. Precision Armament 7 items
  72. Primary Weapon Systems 9 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 4 items
  83. Sharps Bros 6 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. Stern Defense 1 item
  93. Strike Industries 2 items
  94. Surefire 5 items
  95. Taran Tactical Innovations 2 items
  96. Timney Triggers 4 items
  97. Triggertech 1 item
  98. Troy Industries 7 items
  99. TruCalibre 4 items
  100. Tyrant Designs 5 items
  101. V Seven Weapon Systems 40 items
  102. VKTR Industries 5 items
  103. VLTOR 6 items
  104. WMD Guns 8 items
  105. 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 25 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 7 items
  3. AR-10 24 items
  4. AR-15 117 items
  5. FN 509 1 item
  6. H2 Buffer 1 item
  7. SRS-C 3.3 oz. 1 item
  8. SRS-H 3.8 oz. 1 item
  9. SRS-H2 4.7 oz. 1 item
  10. SRS-H3 5.6 oz. 1 item
  11. SRS-BB 5.7 oz. 1 item
  12. SRS-9mm 6.4 oz. 1 item
  13. SRS-AR10 5.7 oz. 1 item
  14. Remington 700 Short Action BDL 1 item
  15. Remington 700 Long Action BDL 1 item
  16. Sauer 100 1 item
  17. WA 1 item
  18. KS 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 4 items
  28. Non-Adjustable 14 items
  29. MCS 2 items
  30. Full Size 2 items
  31. IWI Uzi Pro 1 item
Platform
  1. AR-10/LR308 17 items
  2. AR-15 137 items
  3. AK47/74 5 items
  4. CZ 10 items
  5. FNH 2 items
  6. H&K 2 items
  7. IWI 1 item
  8. Remington 2 items
  9. Remington 700 9 items
  10. Ruger 1 item
  11. Ruger Precision Rifle 1 item
  12. Savage Small Shank 10 items
  13. Sig Sauer 8 items
  14. Sig MPX 1 item
  15. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 827 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 29 items
  21. AR-15 Receiver Set 9 items
  22. AR-15 Stripped Lower Receiver 26 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 8 items
  36. Brace Strap 1 item
  37. Buffer 12 items
  38. Buffer Kit 6 items
  39. Buffer Spring 3 items
  40. Buffer Tube 8 items
  41. Builders Kit 1 item
  42. Castle Nut / End Plate 2 items
  43. Charging Handle 12 items
  44. Chassis 4 items
  45. Compensator 13 items
  46. Complete Upper 9 items
  47. Dust Cover 3 items
  48. End Cap 2 items
  49. End Plate 4 items
  50. Firing Pin 2 items
  51. Flash Hider 13 items
  52. Forearm Accesory 6 items
  53. Forward Assist 4 items
  54. Gas Block 21 items
  55. Gas Tube 1 item
  56. Grip Accessory 1 item
  57. Grip Module 1 item
  58. Gunsmithing Tool 1 item
  59. Handguard 28 items
  60. Handgun 1 item
  61. Handstop 12 items
  62. Iron Sight 1 item
  63. Lower Parts Kit 10 items
  64. Lower Receiver 5 items
  65. Magazine Catch 2 items
  66. Magazine Release 8 items
  67. Magwell 3 items
  68. Muzzle Brake 44 items
  69. Muzzle Device Accessory 12 items
  70. Parts Kit 2 items
  71. Patch 1 item
  72. Pistol Grip 16 items
  73. Piston System 2 items
  74. Port Door Rod 4 items
  75. Rail Adapter 5 items
  76. Rail Cover 2 items
  77. Rail Panel 2 items
  78. Rail Section 2 items
  79. Recoil Spring 1 item
  80. Retainer Pin 5 items
  81. Safety Selector 26 items
  82. Scope Mount 1 item
  83. Shim Set 3 items
  84. Sig MPX Barrel 1 item
  85. Sight Post 2 items
  86. Silent Captured Spring 1 item
  87. Sling Mount 1 item
  88. Spring 1 item
  89. Steyr Aug Barrel 1 item
  90. Stock 32 items
  91. Stock Accessory 5 items
  92. Stock Adapter 8 items
  93. Suppressor 1 item
  94. Take Down / Pivot Pins 6 items
  95. Trigger 36 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 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" 10 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" 27 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 14 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) 100 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 79 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 28 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 11 items
  2. Out of stock 842 items Remove This Item
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