That's sort of what I was trying to check. If you mix up spring, buffer, stock tube length and gas system, you get funky dwell times, over gassing. Hangs. Locks, etc. Just measure everything and look and you will be fine.
A miss gassed system will fire a few shots, but it will quickly get ahead...
I doubt you goofed the upper or lower
the cam pins have been getting difficult to source the past few years and you may just have a crappy pin
a good quality can pin will cost around $30 , a lot of money for such a small item but a well machined pin will be pricy , you may want to try another...
I’m going to respectfully disagree That it’s normal,
With the extremely thin ears of the Colt large pin lower any added tension would be a problem in my eyes and would be immediately rectified to operate without resistance
As you close it up and get to that tension point use your screwdriver and find the sweet spot where it smooths out , at that point lock the screw against itself and give it a go
you will definitely feel it loosen up as you close it when you rock the screw slightly back and forth
I’m betting $5 buck it’s the offset pin
if the pin is too tight And slightly off center it will cause misalignment in the upper and lower causing the BCG to run into interference with the receiver extension
that said if the cam is loose it will move around and do the same thing
if you take a...
Personally , I see a huge difference in fit function and initial quality between the 2 when it comes AR style rifles
again this is my personal opinion from handling Hundreds of these rifles a year
that said , they will both serve the intended purpose, but my vote would be for the Colt