My brother has a Colt HBAR. Thinking about buying a lighter top end. Is the HBAR lower directly compatible with other uppers, such as Larue?
THanks
THanks
Gunsmithing Colt AR-15 HBAR Compatability
- Thread starter Grand
- Start date
Re: Colt AR-15 HBAR Compatability
COLT: Depends on the pivot pin size & if its offset. Large or Small Pivot Pin Hole. If you have a large pivot pin config. you can get an adapter/bushing from lrg to small.
These links should help if you do have the above config., but "You HAVE to measure first":
http://www.brownells.com/.aspx/pid=24948/Product/AR_15_M16_RECEIVER_ADAPTER
http://www.midwayusa.com/viewproduct/?productnumber=599768
Have a great one
COLT: Depends on the pivot pin size & if its offset. Large or Small Pivot Pin Hole. If you have a large pivot pin config. you can get an adapter/bushing from lrg to small.
These links should help if you do have the above config., but "You HAVE to measure first":
http://www.brownells.com/.aspx/pid=24948/Product/AR_15_M16_RECEIVER_ADAPTER
http://www.midwayusa.com/viewproduct/?productnumber=599768
Have a great one
Re: Colt AR-15 HBAR Compatability
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SPDGG</div><div class="ubbcode-body">COLT: Depends on the pivot pin size & if its offset. Large or Small Pivot Pin Hole. If you have a large pivot pin config. you can get an adapter/bushing from lrg to small...</div></div>
True.
The large (.312") pivot pin (actually a double-headed screw) is offset from the normal "milspec" axis, and the offset adapter will allow one to use regular uppers from every other company with your Colt large-pin lower.
If it has the normal size (.245") pivot pin, or sometimes a double-headed screw, a standard upper should just plug right in.
If you have a double-headed screw, chances are it's not drilled for a detent pin and you're stuck with the srewdrivers unless you change something. You can get a pin with a built-in detent to hold it in, or, you can drill the correct 3/32" hole 1.125" deep and install a regular pin, detent & spring.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SPDGG</div><div class="ubbcode-body">COLT: Depends on the pivot pin size & if its offset. Large or Small Pivot Pin Hole. If you have a large pivot pin config. you can get an adapter/bushing from lrg to small...</div></div>
True.
The large (.312") pivot pin (actually a double-headed screw) is offset from the normal "milspec" axis, and the offset adapter will allow one to use regular uppers from every other company with your Colt large-pin lower.
If it has the normal size (.245") pivot pin, or sometimes a double-headed screw, a standard upper should just plug right in.
If you have a double-headed screw, chances are it's not drilled for a detent pin and you're stuck with the srewdrivers unless you change something. You can get a pin with a built-in detent to hold it in, or, you can drill the correct 3/32" hole 1.125" deep and install a regular pin, detent & spring.
Similar threads
