There are threads showing where the extension screws onto the mag. Also, the part of the extension that screws onto the mag is larger than the limiter was so when you break your MAC 1014 down you have to unscrew the extension every time and remove it because the loops on the barrel don't fit over the extension. Going to look for another alternative.

Works great. use the stock spring and save the one that comes with it as a spare, it's not necessary.

It's great.I like others have said before me.I don't particularly care for the fact that it's showing threads. I mean, I'm not a machinist but that could probably be fixed.If it wasn't for the threads showing I would give it five stars.

I really like the way it works so far. I haven’t had the chance to shoot it since I installed it so that will be seen However I do not like that it has to be removed to remove the barrel while the blocked tube did not. We will see how it works

Well worth the extra cost

Would have given 5 stars if there were instructions or a youtube video on installation. Other than that great product

Works well and finish matches but the need of removing the extension to remove the barrel is annoying. If I would have known that I would have went with a complete 7 round 1 piece tube.

I called but no one called me back! I can only load 6 rounds???

Happy I bought it to make my Mac 1014 complete and better looking, this product stands for its high quality, perfect fitment and easy install with an affordable price and reasonable shipping. You can't ask for more! I will buy another one for my second build. Really happy customer here! And really happy with my Mac 1014. Military Armament Corporation is Awesome!