It is a 9mm B&G registered bolt fully transferable on a ATF form 4 in a Group Industries host gun (I believe is a model B). Comes as pictured with the following extras: Folding metal stock Non pistol grip forend. 3x32 rnds magazines. 2 new in the wrap IMI recoil springs with an extra modified rod to accept them easilly. soft case. $7000 All NFA rules apply. Item located in Denver, CO.