hey guys. got a question. this will be my first AR build and i was wondering a few things.

if i get 2 different upper/lower from diff manufacturers, will the fit together as tight as a complete rifle from 1 manuf? (ex: spikes lower and a bcm upper compared to a bcm full rifle straight from the floor)

is there a better or pecking order for stripped lowers and the parts that go inside them? if i get a spikes lower, is there a more sought after trigger/insides from another company?

thx for any help you can give me.

Upper/lower fit is random unless hand picked... regardless if it is a full rifle or separate brands.

Different LPKs offer different options... but in a apples to apples comparison usually there is little difference if any.

is there a better trigger than others? i saw that DD makes a good one.

Milspec no.

It's luck of the draw. Completely random how your trigger will be, they will smooth up with use.

Inexpensive relatively speaking Upgraded milspec triggers are the LWRC enhanced, Spikes Battle trigger, ACT by ALG