[Fullmetal]

My new .40 sub is failing to feed most rounds, even when releasing the bolt once inserting the magazine. Once I pry the jammed round out of the weapon and examine it they all have a deep semi circular gouge. Any ideas would be greatly appreciated.

 

[Artofgolf]

Welcome to the KTOG forum, Fullmetal

If you are able to, posting a few pics of the ammo and more details might help us see & figure-out the problem.

 

[Fullmetal]

Images of the gouging

Thanks. I've posted 3 images of the .40 round(s) for examination.(in the sub2000 area)

Thanks!

 

[gbdeamer]

Thanks. I've posted 3 images of the .40 round(s) for examination.(in the sub2000 area)

Thanks!

You can post them to form threads as well:

 

[texcl2]

Have you tried a different magazine? Always start there with ftf's.

 

[Fullmetal]

Different mag suggestion

Indeed I have used factory Glock mags(2 of them). As I hinted at in the original post it wouldn't even peel the first round off after inserting a fresh mag. Since the post I disassembled the rifle, cleaned the **** out of it, polished the bolt, weight, and inside the tube with 1500 grit paper. Thereafter, I lubed it (left it wetter than I normally would) and reassembled. As a test, I inserted a mag with a couple rounds, released the bolt, ejected the round and did it again several times with no problems. Some more range time may tell if it was just a question of grit, burrs, and/or not enough lube. Should one be very generous in lubing up the bolt assembly on these rifles??????????

 

[gbdeamer]

Indeed I have used factory Glock mags(2 of them). As I hinted at in the original post it wouldn't even peel the first round off after inserting a fresh mag. Since the post I disassembled the rifle, cleaned the **** out of it, polished the bolt, weight, and inside the tube with 1500 grit paper. Thereafter, I lubed it (left it wetter than I normally would) and reassembled. As a test, I inserted a mag with a couple rounds, released the bolt, ejected the round and did it again several times with no problems. Some more range time may tell if it was just a question of grit, burrs, and/or not enough lube. Should one be very generous in lubing up the bolt assembly on these rifles??????????

Good luck at the range. Hopefully your problems are solved.

I clean and lube after 100 - 200 rounds, but I never really leave it "wet".

 

[texcl2]

Ive heard others had troubles with truncated fmjs like you have pictured, in .40. Hope thats not the case with yours as they are the cheapest most available rounds.

 

[DRT]

I had case gouging issues as well. I strongly believe it's due to high bolt velocity with a .40 . The heavy bolt and sumo handle solved the issue. I guarantee you'll be happy if you do these two mods to your .40 sub2000.

 

[Fullmetal]

Thanks for advice.

 

[tlacour]

I had case gouging issues as well. I strongly believe it's due to high bolt velocity with a .40 . The heavy bolt and sumo handle solved the issue. I guarantee you'll be happy if you do these two mods to your .40 sub2000.

This worked for me. I added the heavy bolt as well as the Sumo handle. I also filed down the holes where the pin that holds the shoulder plate in place and the bolt stop. The holes were rough and were gouging the bolt when I was stripping to clean. These all completely changed how the gun shoots. Absolutely no functional problems since. Also, the added weight absorbs much of the recoil so it now feels like shooting a 22 in stead of a 40cal.

Much happier with this purchase once I had gotten good advice here and made some simple modifications. Only thing I'd change is a better sight solution. I don't want to interfere with the folding mechanism or have a bunch of stuff hanging off of the gun, but the low sites make it an awkward position to be in with your face pushed that far down.