So I bought a noveske 7.62 12.5 Leonidas barrel a few years back been sitting on it and the receiver set since then. Decided recently to finish this build. Finish the whole build and realize the carbine gas tube I installed on it was short so it took the hand guard and all that off. put a mid length on, it it's too long scratching my head I then remembered the barrel came with a switch block with a pre-installed tube pulled it out and saw it's between carbine and mid length but that block doesn't fit under my hand guard. I've attempted to Google and find this length but have come up empty if anybody has any ideas or information on this length I'd really appreciate it. Carbine total length is about 9.750, mid is about 11.750, the tube and block that came with the barrel, tube length is about 11.000 even.