A quote that explains the problem:
http://m4carbine.net/showpost.php?p=...&postcount=209
sagmill Offline Manufacturer
Fix
There are a couple of things going on.
The ACT is plated and this adds material to the trigger/hammer and pins. This extra material reduces the clearance with the safety with the bolt locked back. With this reduction in clearance there can be a tolerance interference from trigger to weapon. In some guns there is no problem and in others the safety is hard to turn into safe with the bolt locked back.
With the QMS the same thing can happen due to the larger diameter pins. The poster above is the only case I have heard with the QMS.
The fix is to use normal, stock diameter pins. We are making stock sized nickel teflon and oxided pins that we will send out to anyone who has problems. They will be ready in about three weeks or so.
In the meantime try the stock pins in your trigger and this should take care of most issues until the ALG pins are ready.



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