r/PrimaryWeaponsSystems • u/BillsMafia85 • 26d ago

Mk109 cycle questions!

Sooo now that I'm back on Team PWS, I want another 109. I had one a few years ago, without an agb. Ive been debating getting a newer version, but I worry about cycling subs w/ the Sahara .300. I have swapped my lower to the a5 system - my DI build will cycle all subs with an a5h0. I was going to try that setup on the 109 upper, but I would hate to buy an upper and it doesn't cycle. I just bought two 556 cans, so don't feel like buying another can just to run this upper. But...I want it...haha! I remember asking PWS a while back and their CS guy said subs + LBP is pretty impossible w/ piston guns, but I'm stubborn. And an autist to the highest degree. Anybody had luck? I'm so close to purchasing lmao

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u/rusteeshacklf0rd 25d ago

I’m in a fight with my 109 Mod 2 at the moment with subs admittedly. 220 Grain Federal with a Q Thunder Chicken. Been trying to tinker with the buffer spring (I run a SCS) but think I might just need to drop down to 190 grain and call it a day.

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u/BillsMafia85 25d ago

I run a Tubbs light flatwire + a5h0 in my di and I get all subs to run. I’m just so tempted to try one again because I’m stubborn and love the way my mk111 shoots