You're still missing what I am getting at I think. If the spring was strong enough to make any difference in the safety of the design it would be ridiculously hard to run the action. There is a reason simple blowback designs aren't typically used on rifle cartridges...
Being skeptical about these novel designs, considering how new they are and the limited market they have been released to makes sense. Thinking the spring is going to do anything worthwhile with regards to keeping the bolt forward during an out of battery discharge on the other hand....
What I would suggest to you is play with the design, both an AR and one of these. Do some dry firing and play with the bolt location - fully seated, partially pulled back in varying positions.
You can drop the hammer up to and including with the bolt half seated. With an AR, the hammer should be blocked from striking the firing pin if an out of battery condition is met.
With these straight pulls? I'm not certain that the engineering is being put into these things...At least with the recoil spring I'd feel a bit better knowing there is some force being applied to the back of the carrier keeping it in battery. I'll leave it there.
Beltfed, didn't you have a sort of OOB firing with one of these types of rifles? If so, I mean I understand the skepticism even more. I really don't find what anyone else thinks of how an AR does or doesn't operate to be worth arguing over and doubt you do either lol. But I always appreciate firsthand takes.
I fired a round that vented a fair amount of gas into the upper, shooting around the bolt. My firing pin was stuck in the end of the primer. It was in battery, but I think just.
I'm a lefty, so I had a good view of the proceedings.
It was on a mild hand load of 23 gr. of Varget over a 69gr. SMK, so I do not have any reason to suspect a hot load with a pierced primer, and venting through the primer.
Up to that point I would charge the rifle with a pull back on the charging handle and let the recoil spring along carry the round into the chamber and fire. Now I ride the charging handle forward and force it home like a K31 or Krag.


















































