40 Rounds! CMMG 5.7×28 AR Conversion

Just waiting on my stimulus check lol

A 5" barrel and 4" handguard is just absurdly short IMO. I wear size 3XL gloves and I couldn't even get a hold on a handguard that small. Would have to hold the magwell so I don't potentially shoot my fingers off. Even for people with normal sized hands, that handguard/barrel is too short. I know that have an 8" one, thats much more practical IMO.

So you can shoot the 5.7 through a thunder chicken by q

So the these kits fit on standard AR lowers?

Is it wrong that I immediately notice the cherry bomb and assumed a trash panda incoming?
With the ballistics 5.7 can get off a short barrel and the capacity this looks like a great ar15 pistol build

I haven’t seen other than federal and fn ammo

It's a good home defense cartridge that is troublesome for bad folks out to 200 yards. So they tell me. if true, I want one.

You should have your Cann by now and a new video should follow

I just bought mine today. Whoa hooooooo 🤫

Where the does it state you needed an Carbine buffer???!?!?!

I’m biting the bullet so to speak… I’m gonna get the barrel and bcg ordered from midway right now then I’ll order the Handguard etc next payday 😂

I am in the process of building me a 5.7 x28 Banshee, with a 5" barrel. I have a pistol dedicated lower for a Glock. My question is. Will a FN, EST, or any other mag fit in this Glock lower? A promag or something?

What state / County do you live in ? Because if there's a property nearby with 50 to 100 acres ; you're the kind of person I want for a neighbor 👍

does this 40 round magazine work with a cmmg banshee 300 5.7 mk57?

as a Dday prepper … that looks perfect , but 5.7 seems smaller than 9mm , don't wanna mess up the barrel…. but it's got a place for it in the clip so , idk .. not sure what a buffer is lol , and Wondering how the firing pin hits the shorter round , 🤔 i guess it's the way but it loads from mag to the barrel.

Thx for telling me I need a carbine buffer. No one would help me wi info for swapping upper on my ar lower. New sub here

What brace are you using

Ar pistols and sbr use carbine buffer and springs, why did you have to replace the buffer from your buffer to run that upper?

Need a 10.5 barrel and I’m sold

Sorry, I would rather have an AR57 if I want to shoot 5.7. I hope someone acquires it. 50 round mags are the best mags. Now with pistol braces and the AR57 pistol upper, I think it's time has come and no one is producing it.

I wondered if shooting the AR57 would be hearing safe as it ejects down? It is full ambi. Did I say 50 round mags?

I've had an FN Five n Seven for a long time, been waiting years for a AR platform, got mine built a few weeks ago… love the round, great ballistics and just great of fun.

Where do you find subsonic 5.7??

Waiting on an 11 inch 5.7 upper to ship out. Have a PSA pistol lower with a Larue MBT trigger, Larue grip, and magpul trigger guard waiting. My wife and kids will likely enjoy the low recoil. I have a FN Five Seven as well. Ammo and platform are light. Accurate, and quick follow up shots. If it reaches out 200 meters with the 11 inch barrel, I will be impressed.