Greta's Guns at 4228 East Los Angeles Avenue, Santa Susana, Simi Valley, California.

I was trying to customize my AR-15 and change the barrel nut for the handguard to fit on my AR-15 in the photo. I got a bit frustrated, asked my friend to help me find a gun shop that can do the work. Greta's Guns was the first shop we went to. Right when I walked in I was greeted with "May I help you?".. I told them my issue and they said they can do it, and I added in for them to tighten on the muzzle break. I gave them the upper and I was told I will get a call when its completed. I was called two days later and at a better price then expected. The transaction was immediate and I was out in no time! In and out! I will be heading there frequently for the service I was given!!!