Its stamped " Dlask Arms Corp. 12.5" .22LR"
your barrel should say a little bit more then that on it.
should say something after the 12.5
either X-Treme or Sporter.
unless its one of the 2014 run because i think Dlask stopped making X-treme chambers this year because 90% of the people ordering barrels didnt understand the difference in them and i think he was tired of explaining to people what was going on.
like stated above id imagine you have a X-treme barrel which has the Bentz Chambering which is way tighter then the normal ones.
have a look at your barrel and see if you can find X-Terem or Sporter on it.
or push a round up into it and extract it and see if you can see rifling markings on the lead.
thats a good indication that your chamber is too tight for the rounds your using.
if you are running a sporter barrel and there are no markings on your lead after you do the push in test then your looking at a extractor and firing pin problem.
so then your have to look to make sure your barrel is lined up proper with your extractor, then you have to make sure your extractor is good and working as intended.
after all that your rounds should be extracting.
if they are still misfiring then you need to look at your firing pin and bolt.
have to make sure they are cycling fully forward with no burr's or hang ups.
check your brass make sure you have a good deep strike from the firing pin.
if not you need to replace the pin and spring.
think i have a pic of my barrel to show you what to look for.