Modular? Interchangable? Anybody ever?

AR/M4 AR General Discussion
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MGI modular interchangable lower and an upper with a quick change barrel system.
Anyone have any experience with them or info on them that I can look up outside of their site?

I would think that with all this modular stuff, with hard use it could get kind of ricketty.
Anyone?

http://www.mgimilitary.com/store/index.php?main_page=product_info&cPath=1&products_id=31

http://www.mgimilitary.com/store/index.php?main_page=product_info&cPath=1&products_id=16

Thanks. Sam.

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Shot at a demo full auto 45ACP here in CA – was going to go to VEgas and try out the whole rage of calibers – but they may not have any test guns left with all this buying –

Rainbow of brass with no stumbles – They had the 7.62X39 conversion kit there – it looked to be of the HIGHEST quality – the whole mag well switches out –

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I have their older version upper (tube with attached rails). I do not have the lower. I am not done with the build but it seems to be solid. Waiting on a barrel from an unnamed individual…