Besides a buffer and spring assembly, the action of an AR-15 is inline as well. That with a simple non reciprocating gas tube results in a recoil impulse that pushes straight back instead of up to the right like AKs do. As much as I hate 7.62x39 ARs, their recoil is also very soft compared to the long stroke gas piston system of the AK. ARs with pistons like LWRC or HK416 will have a noticeably sharper recoil impulse even with 5.56 because of that extra moving mass over your bore.I am honestly torn between which one is better, buffer tube vs folding stock. But overall I may actually still prefer a buffer tube over folding stocks.
I have shot 556 from the following platforms, G36, Tar-21, AR-15, Type-97 (556 version of QBZ95), and AR-180.
All of them have pretty low felt recoil, but I feel like AR-15 has even a bit less felt recoil compared to the others (it's super soft shooting), and it is the only one that has a buffer tube.
I have filmed slow motions of me shooting a G36 (18 inch barrel form a default G36E set up) and AR-15 (16 inch barrel, M/P Sport II, not-modified) , and roughly compared the barrel rise. AR-15's barrel rise when shot is a bit lower than G36, and its felt recoil is also a bit less.
Now I am not 100% certain, but from my experience, I feel like a AR-15 style buffer tube really does make felt recoil a lot better. (However, I want to clarify that it's been a while since I've shot my AR-15 because it is banned in Canada so my memory may play tricks on me)
That being said, so if it were up to me to design a rifle for PLA soldiers, I'd pick a a buffer tube over a folding stock based on my experience because I believe the advantages buffer tubes offer significantly outweighs the advantages offered by a folding stock.
Anyone else agrees with me? Do you feel like AR-15's are a bit softer than other 556 rifles? If is, do you think it is because of the buffer tube design or because of other things?
However, you should try out the AK-74 or even a 556 AK if you ever get a chance. Despite the long stroke piston system and extra moving mass, I feel the smaller caliber AKs have even less recoil than ARs. In fact I can control them better in full auto too! The AK-74 brake does help alot in reducing felt recoil, even on 7.62x39.