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To say fast shipping would be an understatement. They shipped my order within 2 hours of me placing it! Got it in the mail in 3 days. Fit and finish is perfect, and function is perfect as well. I got the +4 follower also. The entire upgrade took all of 5 minutes to install, very easy. Gun shot into a 4″ circle at 15 yds before. I cant wait to see how much this helps my groups. Thanks ZR Tactical!

Absolutely stellar service!! My barrel was cut, gas port regulated and shipped back to me the EXACT same day they received it. They’ve earned my respect and future business.

Very good quality, easy to install and affordable. The fit and finish is perfect.

I sent my MPX barrel in to be cut down and threaded from Oregon on a Monday, and got it back Friday! Barrel looks great, suppressor threads on clean and locks up well; couldn’t be happier and truly amazed at the turnaround time. Thanks ZR!

ZR did a cut and thread for my Sig 516, same day they got it, it shipped out the same day. Shoots like a dream. Thanks!!!

I am very pleased with this product. I went from a firearm that was not enjoyable to one that is back in my rotation. I have used three different brands and grains of ammo with know issues

ZR Cut and threaded my 14.5″ 516 to 10.5″. They also did the gas system work. I’m very happy with the upper, and it is gassed perfectly with and without the silencer. Highly recommended.

They received it Friday, shipped it out Sunday! Incredibly fast turn around, dumped 200 rounds through it for a quick zero and zero retention test and accuracy is superb. Could not recommend their service enough, and only at $100! Made me pick them over other merchants and I have not regret my decision

What an outstanding company.

Competitive pricing and great communication, all questions I emailed were answered within an hour over email.

Slide arrived at noon, gunsmithing was done same day and shipped by 5. Craftsmanship was superb, will definitely do business with again!

This is an excellent upgrade, and well worth the money. My Colt/Walther 1911-22 Gold Cup cycles significantly better with the ZRTS spring than it did with the original factory spring. Especially in view of the low price for this spring, it is a tremendous value for greatly improved performance of the gun. Highly recommended.