7; When I e-mailed them, they said to use the factory supplied steel barrel lug piece and transfer it into their stock. When I recieved mine, it had the piece installed. I guess you should be prepared for it to come either way. The magazine capacity was five rounds from the start. This is with the .458 Lott(parent case .375 H&H---if yours is the Rigby, you will probably only get 4 rds down.) I did consider and ordered the replacement mauser magazine spring from Brownell's as a just incase/can't hurt. The spring is very nice just has to be ground for width at the ends to slip into the slots on the floorplate and magazine follower. It is a bit stiffer than the factory spring. Just to clarify, When ready to do battle, load 5 rds in the magazine, place one round on top, a bit forward and press it down just below the bolt face. When you push the bolt forward, the rim will slip under the extractor and be controlled on its way into the breech. This gives you six rounds to sort things out if necessary. Maximun firepower is fun!!! Takes about 1/2 hour of careful fitting to achieve a snug fit for the NECG's front sights and they are really fine sights. Also the large NECG's masterpiece sight protector fits with a few file strokes and looks much better than the factory sheet metal. The more I play with my CZ, the better I like it. Hope this info helps.