It adds more rounds to the capacity

I put it on and the shells would get hung up. I took it back off and re did. seems to work better can only fit 6 rounds not 7?

No instructions. Youtube has several people doing the installation differently.

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