The Air Arms Twice PCP Air Rifle: Part 1

by B.B. Pelletier

Air Arms S400 MPR FT alert!
Before I start today’s report, I want to make an update to the Air Arms S400 MPR FT blog. Blog reader “coax” asked me to adjust the air transfer port screw to see if I could increase the power of the rifle. Following his instruction to locate that screw, I removed the action from the stock, but I cannot locate the screw he mentions. He says it is located below the loading trough, which I took to mean underneath the loading trough (the bottom of the action) at the rear of the reservoir. Well, there’s nothing to see on the reservoir itself, but on the action just behind the reservoir there is a threaded hole like he describes. The problem is that there is no screw inside that threaded hole. And that is the only threaded hole that I can see.

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