kitty kat ar pistol issues

[Colorado Osprey]

The shorter the gas system the more sensitive they are to different loads. Mine only works with 55 grain or heavier bullets and higher pressure loads. Light charge or light bullets do not function reliably.

[Great-Kazoo]

follwo bp's info. any sbr'd upper i have i always polished the chamber and all of them 7.5 10.5 and 14" all run steel cased ammo w/out any issues YMMV

[Circuits]

follwo bp's info. any sbr'd upper i have i always polished the chamber and all of them 7.5 10.5 and 14" all run steel cased ammo w/out any issues YMMV

Steel in general's not the issue - just Tula/Wolf.

Most of my rifles choke on old Wolf, but have run fine for over a decade on a diet of Barnaul or the Bears.

[cofi]

i should mention so we can eliminate the tula that the same thing was happening with brass and we had another pistol there that had the same issues as mine...... all the carbines functioned perfectly with all the ammo/mags there

i think were going to try to add an extractor oring to start and keep working with this thing untill it chugs along with tula or i sell the upper and do a 10"

[Delfuego]

Get the heavier extractor spring too!

[BPTactical]

i think were going to try to add an extractor oring to start and keep working with this thing untill it chugs along with tula or i sell the upper and do a 10"

I doubt throwing parts at the problem will fix it plus why throw out the baby with the bathwater?
Start with the simple things. The gas block idea is a good one-check the entire gas system for any leaks-check that the gas port lines up with the port in the gas block, if the port is blocked partially you've a problem. Gas key tight?
If you get up to Denver slide by and let's have a look.

I would still be rattling DPMS' cage.

[cofi]

what am i looking for leak wise....should i see carbon? ill call dpms but there cust service is the pits and they dont warranty steel cased

[Circuits]

My experience with Kitty-Kats is that they run fine out of the box, and have a properly sized gas port.

I have mine on an RLL-equipped stock DPMS lower, with a telestock and standard carbine buffer, and it runs through mag after mag after mag of brown bear on full auto with no issues at all. Brown bear is notably hotter than many commercial brass loadings, and definitely hotter than tula/old wolf.

If it FTXs with many different types of ammo, then it's likely a chamber issue. Clean the crap out of the chamber and polish it with a .410 shotgun mop coated in flitz, on a cleaning rod chucked into an electric drill.

If you wish to upgrade your extractor, get the black insert, and extra power wolff spring. You can also stick a #60 viton o-ring (viton for higher heat resistance, as regular o-rings will melt in an AR bolt at operating temps) around the extractor insert for even more stiffness.

Different buffer weights are generally used to fix timing, bounce and recoil issues, not FTX.

[DOC]

Checking for gas leaks usually means checking the bolt holding it in place and making sure its properly staked too.

[cofi]

i think were going to try to add an extractor oring to start and keep working with this thing untill it chugs along with tula or i sell the upper and do a 10"

well it worked the oring completely solved the issues been through almost 1000 rounds of tula with no fte at all

thanks to rockymtnrifleman for figuring this out