.17 HMR | Parts
The products included in this category are specific to the Alexander Arms® .17 HMR AR-15 rifle.
The .17 HMR heavy buffer upgrade is a replacement for the standard buffer contained in the recoil cassette and should be used when the rifle features a lightweight fire control group only. This stainless steel, heavier buffer properly balances the weapon when the trigger features a lightweight hammer and/or lightweight hammer spring and will result in reliable cycling of the action. Failure to use this buffer upgrade with lightweight trigger components likely will result in a failure to feed or other issues. Use of this buffer upgrade with a standard-type trigger is not necessary or beneficial. You may view the installation instructions for this part here on our web site.
Nylon spacer used in A2/full-length receiver extensions when the lower receiver is used with a .17 HMR upper receiver assembly. This component fills the space left over in a full-length extension after installing the .17 HMR recoil cassette into it. The .17 HMR recoil cassette has an overall length designed for use in M4-type receiver extensions.