no no if it uses a piston design it would have enough room just think the part to load the round has to be in the back but the accual piston rod is in the top part and goes along the length of the barrel its basically like many bullpups that operate on piston just look at an ak bolt and youll understand my thinking and yes the ak is not bullpup(well you can buy it as one moded) but if i where an arms company id say your rifle is cool and its 7.62x51 nato so its a meat grinder id love to own one speaking of which if you live in the US as i do you can now buy the Tavor-21 (tar-21) israeli bullpup as i sell firearms id say good luck finding one with this semi auto crazyness going around but props on your design i like it it remindes me of the Kel Tec RFB rifle and tavor combined
Ah a beautifully designed weapon. Hell, probably replace the FAMAS series of rifles. Provided of course, the front grip is mounted via a pictinny rail system. Sorry just, very good work, just thinking too much on my part.