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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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2225 Items

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  1. Primary Weapons Systems MK111 MOD 1-M .223 Wylde Complete Upper - 11.85
    Primary Weapons Systems MK111 MOD 1-M .223 Wylde Complete Upper - 11.85"
    $1,029.49
    View Details
  2. JK Armament War Eagle Comp/Flash Hider
    JK Armament War Eagle Comp/Flash Hider
    $125.10
    View Details
  3. Nemo Arms 5.56 NATO Barrel - 7.5
    Nemo Arms 5.56 NATO Barrel - 7.5" (Contract Overrun)
    Special Price $99.92 Regular Price $200.00
    View Details
  4. A3 Tactical Skelestock w/ Picatinny Hinge & QD Socket - 9.5
    A3 Tactical Skelestock w/ Picatinny Hinge & QD Socket - 9.5"
    $259.95
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  5. JL Billet ECO AR-15 Billet Upper Receiver
    JL Billet ECO AR-15 Billet Upper Receiver
    $104.99
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  6. Brigand Arms HOPLITE AR-15 Carbon Fiber Handguard
    Brigand Arms HOPLITE AR-15 Carbon Fiber Handguard
    Special Price $119.92 Regular Price $179.10
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  7. Andro Corp Industries Low Profile Gas Block - .750
    Andro Corp Industries Low Profile Gas Block - .750
    Special Price $15.92 Regular Price $25.50
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  8. Strike Industries Gridlok LITE Handguard - 17
    Strike Industries Gridlok LITE Handguard - 17"
    $229.95
    View Details
  9. Ballistic Advantage Modern Series 5.56 NATO Barrel - 10.5
    Ballistic Advantage Modern Series 5.56 NATO Barrel - 10.5"
    $142.50
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  10. A3 Tactical Large Angled Foregrip w/ Integrated Handstop - Polymer M-LOK
    A3 Tactical Large Angled Foregrip w/ Integrated Handstop - Polymer M-LOK
    $39.95
    View Details
  11. Griffin Armament Low Pro Suppressor Ready RIGID M-Lok Rail
    Griffin Armament Low Pro Suppressor Ready RIGID M-Lok Rail
    $161.00
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  12. Strike Industries AR-15 Polymer Magazine - 32RD
    Strike Industries AR-15 Polymer Magazine - 32RD
    $12.95
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  13. Arms Republic Grand Power Stribog Picatinny Stock/Brace Adaptor
    Arms Republic Grand Power Stribog Picatinny Stock/Brace Adaptor
    $39.95
    View Details
  14. Icarus Precision AR 9mm Billet Stripped Upper Receiver
    Icarus Precision AR 9mm Billet Stripped Upper Receiver
    Special Price $74.92 Regular Price $99.99
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  15. Superlative Arms Adjustable Piston System (Solid) - .625
    Superlative Arms Adjustable Piston System (Solid) - .625
    $260.99
    View Details
  16. Milspec/GI Crush Washer - 1/2x28
    Milspec/GI Crush Washer - 1/2x28
    $1.99
    View Details
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2225 Items

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Shop By
Shopping Options
Category
  1. Bolt Parts 107 item
  2. Buffer Systems 89 item
  3. Charging Handles 90 item
  4. Gas Systems 71 item
  5. Grips 167 item
  6. Muzzle Devices 251 item
  7. Parts & Kits 287 item
  8. Receiver Parts 359 item
  9. Rifle Barrels 227 item
  10. Rifle Handguards 219 item
  11. Stocks & Braces 175 item
  12. Trigger Parts 174 item
Price
  1. Less than $10 61 item
  2. $10 to $25 197 item
  3. $25 to $50 268 item
  4. $50 to $100 449 item
  5. $100 to $250 643 item
  6. $250 to $500 366 item
  7. $500 to $1000 151 item
  8. Greater than $1000 57 item
Manufacturer
  1. 21st Tec 6 item
  2. A3 Tactical 37 item
  3. ALG Defense 6 item
  4. Aero Precision 68 item
  5. Aeroknox 8 item
  6. Andro Corp Industries 8 item
  7. Angstadt Arms 13 item
  8. Apex Tactical Specialties 5 item
  9. Arisaka 6 item
  10. Armaspec 12 item
  11. Arms Republic 13 item
  12. Ascalon Arms 11 item
  13. B5 Systems 9 item
  14. Ballistic Advantage 43 item
  15. Battle Arms Development 49 item
  16. Blackout Defense 9 item
  17. Blitzkrieg Components 17 item
  18. Bootleg 5 item
  19. Boss Barrels 8 item
  20. Bravo Company MFG (BCM) 80 item
  21. Centurion Arms 15 item
  22. Chisel Machining 5 item
  23. Christensen Arms 5 item
  24. Cross Machine Tool (CMT) 17 item
  25. Daniel Defense 21 item
  26. Dead Air Armament 5 item
  27. Dead Foot Arms LLC 12 item
  28. Drew Meyers Defense 8 item
  29. Driven Arms Co. 10 item
  30. Elftmann Tactical 9 item
  31. Emissary Development 6 item
  32. Ergo Grips 8 item
  33. F-1 Firearms 4 item
  34. F5 MFG 13 item
  35. Faxon Firearms 66 item
  36. Fortis MFG 62 item
  37. Forward Controls Design 89 item
  38. Gear Head Works 4 item
  39. Geissele 39 item
  40. Grey Birch MFG 7 item
  41. Griffin Armament 27 item
  42. HB Industries 18 item
  43. HERA ARMS 20 item
  44. HUXWRX 5 item
  45. Heresy Design 6 item
  46. Hiperfire 25 item
  47. Icon Defense 6 item
  48. JK Armament 14 item
  49. JMAC Customs 66 item
  50. JP Enterprises Inc 39 item
  51. KNS Precision 14 item
  52. Kinetic Development Group 9 item
  53. Knight’s Armament Company (KAC) 18 item
  54. Krebs Customs 9 item
  55. KynSHOT 6 item
  56. Lantac 25 item
  57. Lewis Machine & Tool (LMT) 18 item
  58. Mad Pig 6 item
  59. Magpul Industries 77 item
  60. Maxim Defense 29 item
  61. Midwest Industries 32 item
  62. NEMO Arms 8 item
  63. Next Level Armament 24 item
  64. Noveske 57 item
  65. Patriot Ordnance Factory (POF) 8 item
  66. Precision Armament 17 item
  67. Primary Weapon Systems 19 item
  68. Proof Research 16 item
  69. Q, LLC 11 item
  70. Quarter Circle 10 10 item
  71. RS Regulate 6 item
  72. Radian Weapons 17 item
  73. Rainier Arms, LLC 126 item
  74. Rainier Industries 16 item
  75. Reptilia Corp 7 item
  76. Rise Armament 19 item
  77. SB Tactical 8 item
  78. SLR Rifleworks 7 item
  79. Seekins Precision 4 item
  80. Sharps Bros 29 item
  81. Sig Sauer 9 item
  82. Silencerco 14 item
  83. Sionics Weapon Systems 6 item
  84. Sons of Liberty Gun Works 41 item
  85. Spinta Precision 6 item
  86. Sprinco (Tactical Springs) 7 item
  87. Stern Defense 11 item
  88. Strike Industries 40 item
  89. Superlative Arms 14 item
  90. Surefire 12 item
  91. Timney Triggers 32 item
  92. Triggertech 13 item
  93. Troy Industries 7 item
  94. TruCalibre 9 item
  95. True North Concepts 7 item
  96. Tyrant Designs 18 item
  97. V Seven Weapon Systems 68 item
  98. VLTOR 16 item
  99. WMD Guns 17 item
  100. WOOX 6 item
Color
Caliber
  1. .22 ARC 2 item
  2. .22 Cal 2 item
  3. .22 LR 4 item
  4. .223 Rem 1 item
  5. .223 Wylde 23 item
  6. .223/5.56 24 item
  7. .30 Cal 14 item
  8. .30-30 1 item
  9. .308 18 item
  10. .308 Win 15 item
  11. .338 1 item
  12. .357 Magnum 2 item
  13. .38/.357 Magnum 1 item
  14. .44/.45 2 item
  15. .45 ACP 5 item
  16. .45-70 GOVT 2 item
  17. .458 Socom 3 item
  18. 12 Gauge 1 item
  19. 300 Blackout 43 item
  20. 300 Norma Mag 1 item
  21. 338 Lapua 2 item
  22. 5.56 NATO 134 item
  23. 5.56X45 10 item
  24. 5.56mm 12 item
  25. 6.5 Creedmoor 25 item
  26. 6.5 Grendel 12 item
  27. 6.5 PRC 2 item
  28. 6.8 SPC 3 item
  29. 6MM Creedmoor 7 item
  30. 6mm ARC 13 item
  31. 7.62mm 6 item
  32. 7.62x39 13 item
  33. 7.62x51 8 item
  34. 8.6 Blackout 3 item
  35. 9mm 75 item
Finish
  1. Anodize 70 item
  2. Arid 2 item
  3. Bead Blast 5 item
  4. Bead Blast Stainless Steel 1 item
  5. Black 29 item
  6. Black Nitride 4 item
  7. Blue 1 item
  8. Carbon Fiber 3 item
  9. Cerakote 7 item
  10. Chrome 1 item
  11. Clear Hard Anodize 4 item
  12. DLC 8 item
  13. FDE 5 item
  14. Gold 1 item
  15. Grey 1 item
  16. Melonite 3 item
  17. NiB-X 4 item
  18. Nickel Boron 9 item
  19. Nitride 40 item
  20. Nitromet 7 item
  21. PVD/CVD 2 item
  22. Phosphate 9 item
  23. Polished 1 item
  24. Quench Polish Quench (QPQ) 9 item
  25. Red 4 item
  26. Satin 3 item
  27. Titanium Nitride (TiN) 2 item
Barrel Length
  1. 10" 2 item
  2. 10.3" 14 item
  3. 10.5" 42 item
  4. 10.7" 4 item
  5. 11" 1 item
  6. 11.5" 17 item
  7. 11.85" 2 item
  8. 12" 7 item
  9. 12.3" 1 item
  10. 12.5" 18 item
  11. 13" 3 item
  12. 13.5" 1 item
  13. 13.7" 9 item
  14. 13.9" 6 item
  15. 14.5" 34 item
  16. 16" 122 item
  17. 16" Dissipator 1 item
  18. 16.1" 4 item
  19. 16.3" 2 item
  20. 17" 1 item
  21. 18" 66 item
  22. 20" 30 item
  23. 20.5" 1 item
  24. 22" 17 item
  25. 24" 8 item
  26. 26" 3 item
  27. 3.1" 1 item
  28. 3.66" 1 item
  29. 4" 4 item
  30. 4.5" 3 item
  31. 5" 2 item
  32. 5.25" 1 item
  33. 5.5" 16 item
  34. 6" 7 item
  35. 6.5" 3 item
  36. 6.75" 1 item
  37. 7" 4 item
  38. 7.25" 1 item
  39. 7.5" 11 item
  40. 7.75" 2 item
  41. 7.94" 1 item
  42. 8" 11 item
  43. 8.3" 4 item
  44. 8.5" 14 item
  45. 8.75" 1 item
  46. 9" 5 item
  47. 9.5" 1 item
  48. 9.75" 1 item
Option
  1. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  2. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  3. 4.720" 2 item
  4. 6.295" 2 item
  5. 7.870" 2 item
  6. 9.445" 2 item
  7. 9mm 2 item
  8. AK-47/74 14 item
  9. AKM 1 item
  10. AR-10 54 item
  11. AR-15 304 item
  12. AR-9 12 item
  13. Adjustable 14 item
  14. B&T APC 1 item
  15. Blue - Enhanced Power 1 item
  16. Buffer & Spring - 9mm 2 item
  17. Buffer & Spring - H1 3 item
  18. Buffer & Spring - H2 2 item
  19. Buffer & Spring - H3 2 item
  20. Buffer & Spring - Standard 3 item
  21. Bull's Eye 1 item
  22. CZ 29 item
  23. Dimpled 4 item
  24. FN 509 1 item
  25. FNH 2 item
  26. Front 1 item
  27. Full Size 2 item
  28. Glock 4 item
  29. Green - Rifle Length Standard Power 1 item
  30. Green Laser 3 item
  31. Heckler & Koch 2 item
  32. Holed 1 item
  33. IWI Uzi Pro 1 item
  34. JP Silent Captured Spring - 9mm 1 item
  35. JP Silent Captured Spring - Heavy 1 item
  36. JP Silent Captured Spring - Standard 1 item
  37. KS 2 item
  38. Large Lever 3 item
  39. Long 1 item
  40. MCS 2 item
  41. Mid 1 item
  42. Mid Length 1 item
  43. Minimal 1 item
  44. Non-Adjustable 37 item
  45. Orange - Extra Extra Power 1 item
  46. Profile 1 item
  47. Rear 1 item
  48. Red - Extra Power 1 item
  49. Remington 1 item
  50. Remington 700 Long Action BDL 1 item
  51. Remington 700 Short Action 3 item
  52. Remington 700 Short Action BDL 2 item
  53. SRS-9mm 6.4 oz. 1 item
  54. SRS-AR10 5.7 oz. 1 item
  55. SRS-BB 5.7 oz. 1 item
  56. SRS-C 3.3 oz. 1 item
  57. SRS-H 3.8 oz. 1 item
  58. SRS-H2 4.7 oz. 1 item
  59. SRS-H3 5.6 oz. 1 item
  60. Sauer 100 1 item
  61. Serrated 5 item
  62. Sharps Bros 1 item
  63. Sig Sauer 2 item
  64. Small Lever 3 item
  65. Springfield 1 item
  66. Standard 4 item
  67. Vertical Lines 1 item
  68. WA 2 item
  69. White - Standard Power 1 item
  70. White/Red - Intermediate Power 1 item
  71. Yellow - Reduced Power 1 item
Profile
  1. Full-fluted 27 item
  2. Half-Fluted 2 item
  3. Lightweight 2 item
  4. Non-fluted 21 item
  5. SPR 3 item
Gas Length
  1. Carbine 57 item
  2. Intermediate 30 item
  3. Micro 1 item
  4. Mid 106 item
  5. Patrol 1 item
  6. Pistol 43 item
  7. Pistol -1 3 item
  8. Rifle 68 item
  9. Rifle +1 5 item
  10. Rifle +2 11 item
Size
9 Slot
5 Slot
Large
Medium
35mm rings
7 Slot
3 Slot
X-Large
BACK STRAP:Medium
1.9"
3.3"
4.3"
5.8"
2.1"
4.8"
1/2"
Small
BACK STRAP:Large
6"
3"
5/8"
Mount
  1. KeyMod 19 item
  2. M-LOK 182 item
  3. Other 2 item
  4. Picatinny 93 item
Stock Status
  1. In Stock 1508 item
  2. Out of Stock 717 item
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