Technobird007

Jtallen83, that would beH1 or H2 buffer sir.

Hi all...I am new to this forum. Just received my PSA upper and lower, both Gen 2, they both mated very well and seem to fit tight. I will get an optic for this and head to the range for some range time. I will check the if the upper and lower loosen after putting some rounds through it. A question I do have is what is the advantage to using a H2 spring rather than the H1 the lower comes with?