I"m ordering all the parts for my first upper and I am going to let my friend with experience building them assemble it all. However, he is on a two week vacation and I can't ask him questions. So in come you guys.

I ordered a stripped flat-top receiver from PSA along with their ejection port cover assembly and forward assist assembly. I also ordered a BCM Gunfighter complete BCG. I just have a few questions...

Since my receiver doesn't have M4 feed ramps, the barrel I get can have them or can't; it doesn't matter, correct? Also, do I need a low-profile gas block and gas tube to do a free-float tube? And if I'm doing a free-float tube, I don't need a delta ring and all that, do I? The tube will come with what it needs to mount it? Thanks for all the help.

I thought PSA uppers had M4 feed ramps.

This one?




http://palmettostatearmory.com/index.php/ar-15-05/upper-parts/upper-receivers/stripped-unmarked-upper-receiver.html

My recent PSA upper receiver has the ramps. But to answer your question, if it doesn't have the ramps you'll be gtg.

A lo-pro is needed only if you want your free-float rail to extend over the gas block. So realy depends on the length of the rail you'll be installing.

The tube or gasblock may have the roll pin included. Might want to check though.

Ahh, completely overlooked that! I read right over it. Thanks. That makes things a little easier as now I know I need a barrel with feedramps.

Edit** I overlooked it because I bought a blemished upper and that item description doesn't indicate feedramps lol

I got one of the blem uppers, it DOES NOT have M4 feedramps. Still seems like a good deal.

More conflicting info lol. I guess we'll just see when it gets here. I won't be buying the barrel for a few days, anyhow.