bobk538447 Posted June 23, 2017 Report Share Posted June 23, 2017 (edited) If anyone is wanting to know how to mate the larger hole DPMS upper with the small hole AR lower take down pins on the POF receiver, the solution looks like it can be solved with a couple of "Colt Receiver Adapter Offset Bushing". For the younger guys Colt AR-15s use to have two different size pivot pins. If you look how the upper mates with the lower you can see that the holes appear slightly offset. I found some online for $3.50 a piece which is pretty cheap. When I get hem in I will let everyone know how well they work. Hopefully, this will help the guys who bought stripped POF lowers. Edited June 23, 2017 by bobk538447 grammer Quote Link to comment Share on other sites More sharing options...
survivalshop Posted June 24, 2017 Report Share Posted June 24, 2017 (edited) 11 hours ago, bobk538447 said: If anyone is wanting to know how to mate the larger hole DPMS upper with the small hole AR lower take down pins on the POF receiver, the solution looks like it can be solved with a couple of "Colt Receiver Adapter Offset Bushing". For the younger guys Colt AR-15s use to have two different size pivot pins. If you look how the upper mates with the lower you can see that the holes appear slightly offset. I found some online for $3.50 a piece which is pretty cheap. When I get hem in I will let everyone know how well they work. Hopefully, this will help the guys who bought stripped POF lowers. We have seen this before , just adds to the possibility of potential Tolerance Stacking . Keep us informed , these miss match combo's are always interesting . if you look hard enough back a few years , you will find a Thread on this subject . Edited June 24, 2017 by survivalshop Quote Link to comment Share on other sites More sharing options...
98Z5V Posted June 24, 2017 Report Share Posted June 24, 2017 4 hours ago, bobk538447 said: If anyone is wanting to know how to mate the larger hole DPMS upper with the small hole AR lower take down pins on the POF receiver, the solution looks like it can be solved with a couple of "Colt Receiver Adapter Offset Bushing". For the younger guys Colt AR-15s use to have two different size pivot pins. I hope they work, because that's AR15 shiit, right there. Those bushings and adapters work for the AR15 pin sizes of 0.154" (small pin) and 0.169" (Colt large pin, with a bore of 0.170" that they go into). I don't think that's gonna work on large frame ARs, because the pins sizes are already larger than that. Also, Colt did that to confirm that no "unauthorized" uppers and lowers were mated together, as a ban-move. That's the only reason they made the large-pin receivers, and they were the only company to do it. The Colt large pin receivers were made between 1990 and 2009. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted June 24, 2017 Report Share Posted June 24, 2017 Wonder if Pin length may also be an issue with them . Quote Link to comment Share on other sites More sharing options...
98Z5V Posted June 24, 2017 Report Share Posted June 24, 2017 It would for pins, and bushings would be narrow - but have a better chance. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted June 24, 2017 Report Share Posted June 24, 2017 (edited) I suppose a set of Bushings made would work . Wish I could find that Thread here on this , someone mated a set like this & it worked , but had issues & changed to a different lower or something like that . It was a long time ago . Found it , it doesn't have much info & one of the links is dead , I thought it had more info . Edited June 24, 2017 by survivalshop Quote Link to comment Share on other sites More sharing options...
bobk538447 Posted July 8, 2018 Author Report Share Posted July 8, 2018 My project has been sitting for awhile between work and other things. The colt receiver adapter bushings were too big for the DMPS upper receiver holes. I didn't want to mess up the lower receiver and plan on getting a different upper receiver later on anyways.. I took the plunge and drilled the front upper receiver hole out with a 5/16" drill bit half way from both sided. The bushing slide in nicely. The upper receiver is tight to the lower receiver with no slop. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted July 8, 2018 Report Share Posted July 8, 2018 I miss Jgun. I have a box full of those Colt offset bushings. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 8, 2018 Report Share Posted July 8, 2018 4 hours ago, Robocop1051 said: I miss Jgun. Same here. See if you can drag him back here... Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted July 9, 2018 Report Share Posted July 9, 2018 3 hours ago, 98Z5V said: Same here. See if you can drag him back here... Tried. I sent him an email a few weeks ago. There was no response. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 9, 2018 Report Share Posted July 9, 2018 1 hour ago, Robocop1051 said: Tried. I sent him an email a few weeks ago. There was no response. Sounds like a rescue mission. Got contact info? We can find him. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted July 9, 2018 Report Share Posted July 9, 2018 Only thing I can find on him is an out dated scam list. Looks like hackers got his PW. There is a Jgun on several other sites. I may have to try to stalk him there. Quote Link to comment Share on other sites More sharing options...
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