TACSHIM Head Space Bolt Shim Kit for CZ 457 (20 Pack) MFR#457BS

If you're serious about competing with your CZ 457, especially once you've shot your gun enough to wear the bolt in, you need this. Taking the time and effort to match your bolt's headspace to your ammo makes all the difference in the world.

Good quality easy to use very durable fit perfect so great functionality and a great value for the money made of durable metal

I have a benchrest 457 that I've been slowly improving over the last few years. The Lilja barrel I bought for it came with it's own headspace adjustment shims, so I didn't need these for mine. I did, however, purchase a smaller Scout model for my children to learn on, and I wanted to accurize it a little bit. I was able to get it shooting a bit more accurately with the bulk SK I bought for practice, but I really wish they would have included .001" shims to really dial it in better. The smallest size here is .002" Nice little kit to keep on the work bench!

This kit has some different thickness shims than I normally see for the CZ 457. Most kits have some thinner shims, and they don't go as thick as this one does. You should obviously use as few shims as possible to get the headspace you need, but I feel like having some on the thinner end would be nice. That being said, most of the CZ's that I have shimmed needed about .002-003, and those are included. These shims don't have any information on the box about where they are made, and I couldn't find that info online either. Since most products like this proudly announce that they are American made, you can make your own decision.