Nerf Mega Bigshock with Lockback

A remix of the Bigshock mod. I changed the sled up so I could use a spring down the middle to create a spring-loaded lock-back effect. I also changed up a few of the hole sizes to use M3-sized hardware and heat brass inserts.

Also included is a remix of the hand stop, and a suppressor with a little support thingy, if you're into that kinda thing.