9 years ago
The spaceguns have a bolt handle screwed into the side of the bolt carrier, and there is a slot milled in the upper receiver to clear it. You could use the charging handle on a regular AR to get it rolling, but after that, the bolt should lock open after each shot. The side bolt arrangement is needed if you have an adjustmable cheekpiece, because the charging handle typically won't clear the cheekpiece if it's at a good height for most shooting. Here's a photo of the two rifles I built:
There are special single round followers that you can put into the magazines so you just drop a round in and close the bolt to load.
This model just snaps in on top of a regular follower, and you don't have to take the magazine apart.
Doug White Doug White