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Posted: 10/6/2004 11:15:17 AM EST
I have a mid-1980 Colt Sporter HBAR. Used its lower receiver to mount my M4 upper on.
Can I mount the HBAR upper (large pivot pin) to a new lower with the smaller pivot pin hole?
If so , what do I need to do it.
Thankshinking.gif
Link Posted: 10/6/2004 11:26:48 AM EST
Here

Never have tried one, but here is one option I know of.

Danny
Link Posted: 10/6/2004 11:31:29 AM EST
you need those conversion pivot pins, I heard they're a pain to use though.
Link Posted: 10/6/2004 10:19:27 PM EST
[Last Edit: 10/6/2004 10:22:25 PM EST by Raptor22]
For a large hole upper, all you need is an offset bushing that costs $3.00. You can get it from Al's Custom or DPMS. DPMS presently has free shipping on all online orders.
Link Posted: 10/7/2004 3:52:14 AM EST

Originally Posted By kon3:
I have a mid-1980 Colt Sporter HBAR. Used its lower receiver to mount my M4 upper on.
Can I mount the HBAR upper (large pivot pin) to a new lower with the smaller pivot pin hole?
If so , what do I need to do it.
Thanks



got a friend with a lathe ?? i make two bushings from hard brass O.D. is .312" actually i make them .316 so they fit snug & do not fall out (5/16th inch) then drill out .250" (1/4 inch) hole & assemble with small pin.
Link Posted: 10/7/2004 9:10:18 AM EST
Many thanks
Link Posted: 10/7/2004 4:24:41 PM EST
Dont spend too much money.... you could get close to the cost of a new *in spec* upper... and be done with it.
Link Posted: 10/8/2004 7:59:48 AM EST

Originally Posted By AR-15NUTT:

Originally Posted By kon3:
I have a mid-1980 Colt Sporter HBAR. Used its lower receiver to mount my M4 upper on.
Can I mount the HBAR upper (large pivot pin) to a new lower with the smaller pivot pin hole?
If so , what do I need to do it.
Thanks



got a friend with a lathe ?? i make two bushings from hard brass O.D. is .312" actually i make them .316 so they fit snug & do not fall out (5/16th inch) then drill out .250" (1/4 inch) hole & assemble with small pin.



Lowes and Tractor Supply offer 5/16" bronze bushings about 1" long with a 1/4" hole in them. I got one and cut to length with my Dremel. It fit right in the upper. The bushing IMO needs to have the hole offset slightly for the upper to close all the way (mine was tight, didn't want to force it).

Danny
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