No matter what I did or how I threaded the extension on, I could not get more than 5 shells into the tube with the extension installed. Every time I would get to the 6th shell, I could not load it and the spring and follower would get stuck, requiring the tube to be taken apart again. Wasted 3 and a half hours trying to make it work. Save your money and buy a full length tube instead. Only reason I did not rate 1 star was because of the excellent customer service and the quick, simple return process.

I’m thoroughly disappointed and a little upset by this product. It went on and everything but as soon as it was tightened the way it needed to reassemble the gun the follower would hang up on the connection getting dislodged. No matter what timing and tightening I did to the tube it never worked.

Adding 2 more is great

Well-made. Great price.

Thank you very much for timely attention.

Not worth the money, wish I had read these reviews before purchasing

The tube was not perfectly round. The follower would get stuck in the tube. I was able it fix it myself but it was a pain. I should have returned it but I bought it a couple months again.

Got it figured out. Attach the coupler first without the extension. Insert the original spring because you really don't need the other one. Then put the spring cap inside the extension and use a dowel to seat it all the way down. Attach the extension to the coupler. Attach barrel and screw cap. Conduct function check of firearm. Load 7 rounds. Took to the range the next day and went through a box of target rds in no time.

Installation is actually somewhat simple however, the 6th round barely gets loaded and then if it does get 7 inside it seems like the spring doesnt help with the reloading at all. Had a few rds get stuck in the tube. Considering returning.