My friend ordered one of these. It's suppose to be delivered today. Only reason why he got the AR is because of this. He has a FN PS90, so he wanted to keep the same caliber. I'll have to ask him about where it ejects when I see him and the set up tomorrow.
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Seems like an awkward combination there. Access to the magazine could be quite difficult with optics attached. Also, think about firing inside a building with concrete floors in a combat situation. The spent brass being dropped at your feet could be troublesome.
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Both the PS90 (which I own) and the AR57 (which I don't own) feed from a longitudinal topside 50rd magazine that feeds the rounds via a 90 degree spiral tunnel into the chamber. The action is straight blowback and the AR buffer spring system is used. The casings eject straight down, via the mag well in the case of the AR57. This makes both the PS90 and AR57 completely ambidextrous. The downside is that the casings end up under your feet. They sell a fabric pouch brass catcher for the PS90 and it would be easy to make a similar one for the AR57. Some people have removed the top, follower, and spring from an AR mag to make a metal brass catcher for the AR57, but there is a chance a casing could bounce up into the action. The 5.7x28 is a neat, flat-shooting little round and the PS90's bullpup design is very compact and fun to shoot. The PS90 is fascinating to disassemble due to its ingenious design. The AR57 shown in the link would be restricted due to the short barrel. You would want a 16" AR57 upper. One advantage of the AR57 would be to practice shooting your AR system at an indoor range that does not allow rifle calibers. You could also build an AR57 with a nice match trigger. The bullpup design of the PS90 requires a long trigger bar that makes the trigger somewhat heavy and spongy.
i would love to have one of those for a SBR, but for a full size rifle it kinda defeats the purpose of the 5.7 round which was for smaller weapons, why use a less powerful 223 if the rifle is full sized?
but i would love to get a shortened version to use on my SBR lower.
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Quote:
Originally Posted by sourpatch45
i would love to have one of those for a SBR, but for a full size rifle it kinda defeats the purpose of the 5.7 round which was for smaller weapons, why use a less powerful 223 if the rifle is full sized?
but i would love to get a shortened version to use on my SBR lower.
I agree. Though this looks friggin' awesome, it's a sub-standard round. At best it's around 2300 fps and sub-400 ft/lbs of energy. No thanks, I'll stick to my 5.56x45.
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