It has already been done for military. I watched it on military ch, top 10 sniper rifles. Desert tactical arms, bullpup.Covert is 26'' oal w/16'' barrel in 308. There are 8 other chambering and all switch barrel. A 338 LM IS 37.5'' oal w/26'' barrel, max is 27.5 barrel. You can take one chasis and have 1/2 doz. different set ups. They also have a 50 bmg and 375 cheytac. You can get 243,308, 260 REM,6.5X47LM,7WSM,300WN,338NM,338LM. I have seen guys on the sniper hide have them.