Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
cut my barrel down?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="LouBoyd" data-source="post: 608599" data-attributes="member: 9253"><p>An additional consideration on shorting AR-15's is the length of the barrel past the gas port. </p><p>There are four common gas port loactions for AR-15. Those are rifle, mid, carbine, and pistol. </p><p>The pressure and the duration of the pressure after the bullet passes the gas port to the time the bullet exits the muzzle determines, along with the diameter of the gas port, the energy available to drive the bolt carrier. It you cut off the barrel you may need to enlarge the gas port a bit to make up for the reduced gas impulse. If you cut off the barrel within a couple of inches of the gas port the rifle may not function at all. it is possible to move the gas port to a different location.</p><p></p><p>Tuning AR-15 can be difficult. They're designed to be fairly forgiving, but there are a lot of adjustable variables: </p><p>Barrel length</p><p>Gas port location</p><p>Gas port diameter</p><p>bolt carrier mass</p><p>buffer mass and structure</p><p>buffer spring rate</p><p>buffer spring length</p><p>Stock length( spring chamber) </p><p>Bullet weight </p><p>powder weight and burn rate (several interrelated parameters)</p><p>Muzzle device (particularly a suppressor)</p><p></p><p>It's a lot easier just to purchase a new upper and keep the longer barreled upper for when you want higher velocity. 24 and 26" AR-15s generaly work well on bipods or bags.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 608599, member: 9253"] An additional consideration on shorting AR-15's is the length of the barrel past the gas port. There are four common gas port loactions for AR-15. Those are rifle, mid, carbine, and pistol. The pressure and the duration of the pressure after the bullet passes the gas port to the time the bullet exits the muzzle determines, along with the diameter of the gas port, the energy available to drive the bolt carrier. It you cut off the barrel you may need to enlarge the gas port a bit to make up for the reduced gas impulse. If you cut off the barrel within a couple of inches of the gas port the rifle may not function at all. it is possible to move the gas port to a different location. Tuning AR-15 can be difficult. They're designed to be fairly forgiving, but there are a lot of adjustable variables: Barrel length Gas port location Gas port diameter bolt carrier mass buffer mass and structure buffer spring rate buffer spring length Stock length( spring chamber) Bullet weight powder weight and burn rate (several interrelated parameters) Muzzle device (particularly a suppressor) It's a lot easier just to purchase a new upper and keep the longer barreled upper for when you want higher velocity. 24 and 26" AR-15s generaly work well on bipods or bags. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
cut my barrel down?
Top