from what i hear from eryn from wildcards, these guns rock. It doesn't need an LPR because of the spring return.
Now this is what I think: The LPR usually controls the guns recocking pressure. Because the ram is returned/recocked by a spring, it needs no LPR. And because you aren't using air to recock the gun, it makes it more efficient. This is kind of the opposite of bushmasters because the spring pushes the bolt forward instead of back, which is why they still need an LPR to return the ram. So this gun is similar, but different to a lot of guns. No doubt its efficient though.