Nice piece of engineering, but it's not a new concept weapon. I believe HK was developing something along these lines back in the 80's, which was a "low-recoil, case-less 12 guage" shotty, but they discontinued it due to lack of interest.
It sure would be effective, but what would you use this for? I guess room clearing it could find a home, but talk about overkill huh? I do also find it difficult to believe that a 12-guage of any kind has an effective engagement range of up to 200 yards...
I used to own a semi-auto USAS-12. It was a very nice gun firing from a 10 round box mag or a 20 round drum. The full auto version was in use with LE and military - that may be what your SEAL friend was using.
That was until the BATF decided to reclassify it, the Stryker-12 and the Street Sweeper (two low-cost POS) as "destructive devices" and I had to surrender it to a Class III FFL for a $1300 loss. Don't count on seeing or getting one of these unless you deal with a Class III.
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