I have finally assembled my blue line lower, only part that doesnt fully fit is rear take down pin, but just a bit of sanding will take care of that
it was also my 1st lower build, I installed the whole trigger assembly 1st, cocked the trigger and the safety went right in (cocking pushes that part in the 1st pic down allowing safety to go in)
fits perfectly tight to my upper, but have not test fired yet. serial is A0001x
really need to oil it to get rid of this white powder or residue that came applied on the receiver
OP, try to get a caliper or ruler and measure the distance of the pin holes and selector holes to the top of the receiver, see if something is off. or maybe something wrong with the LPK?
it was also my 1st lower build, I installed the whole trigger assembly 1st, cocked the trigger and the safety went right in (cocking pushes that part in the 1st pic down allowing safety to go in)
fits perfectly tight to my upper, but have not test fired yet. serial is A0001x
really need to oil it to get rid of this white powder or residue that came applied on the receiver
OP, try to get a caliper or ruler and measure the distance of the pin holes and selector holes to the top of the receiver, see if something is off. or maybe something wrong with the LPK?


















































