Now is the time to stock up on AR-15 Bolt Parts that you may need to keep your rifle running. We've paired the most common field replaceable parts into one value priced kit to give our customers the best option in spare parts. All parts are produced to MIL-SPEC standards and will function in any .223/5.56 caliber AR15 rifle.

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 American Owned and Operated

20+ Years In Business


Each AR-15 Bolt Parts Kit Includes:

  • Extractor (P/N: 8448512)
  • Extractor Spring (P/N: 8448755SP)
  • Extractor Pin (P/N: 8558513)
  • Firing Pin (P/N: 8448503)
  • Firing Pin Retainer (P/N: 8558504)
  • Bolt Gas Ring (3) (P/N: 8448511K)
  • Ejector (P/N: 8448515)
  • Ejector Pin Spring (P/N: 8448516)

Looking for M16 Full Auto Parts?  We've got M16 Hammer, M16 Trigger, M16 Selector, M16 Disconnector, and M16 Auto Sear Assembly for sale!

More Information

United Defense LLC
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Customer Reviews

Good for my use
Review by Waylan Z.
Verified Buyer
Perfect replacement bolt group parts kit for my AR15.
Good Website
Review by Macario W.
Verified Buyer
Received in two days after buying. Will be back to buy at KS again.
Great Seller
Review by Jaxsen G.
Verified Buyer
Delighted with this company.
Fast Delivery
Review by Nkosi C.
Verified Buyer
Satisfied with this order.
Review by Drexel O.
Verified Buyer
The replacement parts are excellent. Would absolutely buy again.
Thanks keepshooting
Review by Garett O.
Verified Buyer
Leading AR15 bolt group parts kit for the buck sold by a awesome company. Thank you KS!
Fast Shipping
Review by Socrates U.
Verified Buyer
Cost is perfect and shipping was speedy.
Fast Delivery
Review by Demetrick M.
Verified Buyer
Functions great as a replacement bolt group parts kit for my AR15.
Exactly as described.
Review by Sal O.
Verified Buyer
The AR15 bolt group parts kit are good. Would absolutely recommend.
Review by Maynor X.
Verified Buyer
Delighted with this order.

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