Hello

Recently purchased a second hand LMT MWS off of gunbroker. I am pretty sure it is the older model, it has a quad rail and single ejector. I have been away from firearms for quite some time while in school so these issues might just be me shaking off the dust so please bear with me.

So far I have noticed:

The mags are more difficult to insert than I remember in previous AR15s i've owned.
The mags also do not drop free. I need to strip every mag by hand before reinserting a new mag.
I cannot press check. It is EXTREMELY difficult to bring the bolt partially back to see brass. I need to muscle it so much that most of the time I pull the CH back all the way and eject the round.

Other than these things the rifle ran great.. Are these normal quirks of the Ar10 platform? I have been using Hex mags and Pmags with ZQI brass. Unfortunately I live in Jersey and am limited to my mag selection.

Thanks!