Well I bought one used, had big doubts that were justified when I tried to work the action by hand, it carved off the the bottom of the bullet tip as it entered the breech, and jammed,,,, a lot,,,,,,,,,,,so,,,,using using 600 grit I polished the breech face to help the bullet make the journey from mag lips to breech, polished the lips a lot on the inside using dental tools and 600 grit and lastly shimmed the part of the mag that fits into the well with black electricians tape to tighten up the fit,,,, to my amazement the gun will fire round after round with only the odd jam, no different than my 25 round mag, cool looking, and it works really good. took about four hours.
Promag 50 rnd mag for 10/22 lowdown
- Thread starter boing-whap
- Start date
I d like to see pics as well . Mine is on the way and im pretty sure ill have some minor fiting to do .I'm sorry, no pics I'm a bit of a E-Tard on that front, however I don't think visuals are going to be helpful, its more of an intuitive thing, the breech must be polished to aid smooth movement inward and upward, and the lips of the mag must be smooth and burr free to aid the bullets travel forward and up, and lastly the part of the mag that enters the mag well should have very little movement side to side and front to back, I also had to remove some of the steel of the lips with a round file on the front right leading edge of the lips to allow the extractor to work. Every gun stock will be different as my tapco t6 would not accept the shimmed mag and my stock wood stock will. It might sound complicated but your finger tips and watching the bullets movement will be your guide. I hope this helps clarify my post sorry that i don't have pics.
I had to spend about the same amount of time with my Promag but in my case it was in reshaping the feed lips. And they do say in the instructions that it take several bricks before it will run smoothly. Mine runs good but I still get the odd jam.
I spent $50.00 on the used one, and I don't mind the challenge of modifying a piece of kit, I enjoyed the time it took and felt a that I had accomplished something when it functioned so well, I posted my experience so others who may have wanted one but were unsure because of all the bad reviews would know that the problems could be solved. At the range a few days ago the only jams I had were with a couple of cases getting caught up in the action at ejection, not jamming on entry into the breech. I was taking a chance buying it and the guy selling it told me had lots of jams with it, but I had read several good reviews too, bit of a gamble.
Scott Max Danger
CGN Regular
- Location
- Saskatchewan
4 hours is alot of time to waste considering it only take a few seconds to flip a double stacked 25 round also you should be able to hit what your aiming at within 25 shots i'd hope. 
I've had good luck with the 3rd Generation Pro-Mag drum, the one with the winder on the back.
It does need some break in time.
It is also very important not to rim-lock the rounds when loading the mag.
The brand-new 10/22 we tried this mag in had a very sharp chamber mouth edge that did shave some lead from the bullet tips, knocking off the sharp edge reduced the shaving considerably.
It does need some break in time.
It is also very important not to rim-lock the rounds when loading the mag.
The brand-new 10/22 we tried this mag in had a very sharp chamber mouth edge that did shave some lead from the bullet tips, knocking off the sharp edge reduced the shaving considerably.
