Is the bolt wet with lube? How many rounds has this rifle fired? This platform doesn't always run at first. Use a different brand magazine. Just a few things to look at.
You will find the buffer tube is a bit longer than the AR-15 carbine stock tube. Buffer is also a bit longer.
This is Stoners' design and it works if your gas port is right.
This post is 9 years old. OP hasn't been here since 2013.
If you have a problem please start a new thread with the info we need to help you out.
Ease by the intro section and introduce yourself.
Here is what I just ordered. We'll find out if it's worth a$hit.
https://www.sportsmansguide.com/product/index/losok-custom-arms-ar-10-semi-auto-bolt-carrier-group-nitrite-finish?a=2241595
The section that goes in the charging handle slot. How is it held on?? Is the forward assist hanging up on a bolt hole holding that part on? Just drive the forward assist pin out enough to remove the forward assist. You don't need to drive it out all the way.