Reminds me of something you'd see in the Mutant Chronicles.

You want one

I just realized it's sorta between an ak47 and bolter in looks

shoot em up

Nice model.

It uses existing technology and a standard .50 cal. round, the blowback mechanism might be a bit underpowered. For such a large caliber bullet, a Long-Recoil or even bolt-action combined with recoil-absorbing devices might be more practical. Also, unless your fursona is really strong, a muzzle brake and bipod or monopod might be useful. Also, I would forego the full-length barrel shroud. It's not needed for a rifle of that caliber, and will add weight. At the very least, turn it from a solid block into a pierced-sheet shroud, half length or full length. You need a shroud when the barrel will grow hot from prolonged firing, i.e. air cooled machine gun, to protect surrounding objects and/or hands, and also when the barrel is used as a front grip, which, I don't imagine, would be the case here. for support, remove the top of the shroud and slim down the width of the lower half to serve as a support for a bipod or a grip. Another note: a scope might be necessary, for the kind of jobs a .50 caliber rifle might be used for.

If you were not, in fact, trying to create a sniper weapon (which I assume was NOT the case [see tactical in the title]), then go for a smaller caliber of bullet. I would suggest 5.56 x 45mm or 7.62 x 52mm. Both of these rounds are highly effective anti-personnel rounds, currently used in today's weapons. The M14 uses the 7.62 x 52mm, and the M16 uses the 5.56x 45mm.

PM me if you have questions or stuff, let's not clutter the comments.

cool thing of the 14.7mm rounds is that you get many more types then there are for 5.56 or 7.62 cal guns

as for size, my fursona is quite large, 9'4"

as for the scope part, a friend who's a better renderer then me is adding a rail and muzzlebrake

wow that is heaps cool!!

Yup