I've done a little reading and a little talking to people about these rifles. I'm interested in the Bushmaster brand. Do they make one with a 14.5" barrel (I know it has to have the flash suppressor mounted to the gun to make it 16")? Also could you get this gun with the removable handle (the A3 I think its called)? Also does the extending stock come from the factory on one? I guess the main question is can you get one with all three of these things? If so what is the model number I should be looking for? Thanks for any help.