KA M4A1 Barrel twist issue
 

I just bought this gun from a member and the barrel twists.
I've fix wobble before, But have no idea how too fix the twist issue.

And help would be great.

You need shims that usually come with the KingArms rifles/delta rings.

The flange is usually a bit on the thin side in all KingArms I worked one (30+ in the last month...).

http://www.airsoftparts.ca/store2/in...376357577fea28

You mean the barrel is crooked? That's a common issue as well and one that won't be addressed via shims. It's not noticeable unless you are trying to install a rail system.

You'll need a new outer barrel.