OR.. Put the smallest scope on your stock VSR, put the Barska 6.5-20x-50mm on the M40a3 and get a scope with a lens cover for your Smokey's one, since the VSR with the Smokey's stock is the longest, a long scope would look Awesome. Then all your gun's optics would be taken care of! And not to mention they would all look totally cool!
By the way nice work, I really like the unique custom M40a3 with a twist. You'll be the ONLY one with that gun FOR SURE!
