Unicorn Airsoft Screw Adjustable Hop Up Chamber and Inner Barrel Kit for UMAREX GLOCK Airsoft Gas Blowback Pistols
(Model: G17 Gen.5 v2 / 97mm)

"Fits Elite Force Glock 45 Gen 5. Just need something to cover up the end of the barrel as it will stick out or just get the Glock 19 version

"First of all it was a decent inner barrel. My only complaint is that with the HopUp, I had to open my Umerax Glock 17 Gen 5 each time to be able to have access to the HopUp which eliminates the original HopUp on my pistol which I had access to without opening my pistol. And I had bought the outer barrel as well and it wouldn’t really stay together because of the screw that’s supposed to keep them together kept becoming loose each time I shot my gun. But I won’t say much for the outer barrel here for that’s for a separate review on their outer barrel page. Overall decent inner barrel and HopUp but wasn’t worth the price.

Pros:
-Helps reduce recoil ( just a tad bit)
-Easy to install
-Good HopUp response

Cons:
-Would become easily loose from the outer barrel each time I shot my Glock
-Takes longer to adjust HopUp by opening your Glock and fixing it from the inside rather than from the outside with a L wrench
- expensive