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12/29/2008 6:59:36 PM EDT
I built three lowers tonight one Bushmaster and two Double Stars using RRA LPK's.  This is the first time I have ever built a lower and it came off without a hitch with the exception of all three bolt catches.  While they are installed, all three of the seem to be real tight and you can hear a slight metal to metal sound while manipulating them.  Im guessing that it is just becouse the parts are new and once the finnish wears a little they will free up some.  My question is, am I thinking right on this issue or do I have a problem?  Like I said they all three seem to function but they are just tight and stick a little.  Any advice or insight would be appreciated
12/29/2008 8:59:58 PM EDT
[#1]
As long as they function reliably, no worries.  Lube them up and cycle them a a bunch of times by hand to wear them in.
12/30/2008 12:00:16 AM EDT
[#2]
....
12/31/2008 2:33:27 AM EDT
[#3]
And go figure...I dropped a Stag LPK into a new Bushmaster lower tonight and I had the same issue.  The bolt catch was snug, but loosened up with a heavy CLP application and working it a bunch of times.
12/31/2008 9:16:30 AM EDT
[#4]
The Parkerizing and hard anodizing are working against each other.  Both "build up" the surfaces they are applied to, making for rough contact and high friction.

I coated mine with a THIN COAT of dry film lubricant and that solved the problem.
1/1/2009 5:50:10 AM EDT
[#5]
is the hammer against the bolt catch or is the hammer in the cocked position?
1/1/2009 6:47:09 PM EDT
[#6]
You could take one out, sand both sides, and test the feel before replacing with the roll pin and decide if it's worth it for the other.  I've had the same thing happen to me, I was too lazy to take it out and sand it, but, it's one of those things that I think about from time to time.  However, it is functional and will wear over time ––the only thing that bothers me about that is the grit will work it's way into the plunger and bolt catch area on the lower and, well, will continue to serve as an abrasive.  I figure I'll just try to spray it out from time to time and will eventually forget about it when the friction stops.
Depends on how much time you have and how much of a perfectionist you are I guess.  The big question is consistent functionality ––easy to check with an empty mag.
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