Air Arms S400 MPR FT: Part 4

by B.B. Pelletier

Part 1
Part 2
Part 3


The Air Arms S400 MPR FT rifle still has a surprise for us!

This special report about the Air Arms S400 MPR FT rifle was unplanned, but blog member Coax asked for it. Today will serve as the best lesson I’ve ever written on how to properly use a chronograph, because I made a huge mistake and the chronograph straightened it out for me.

Coax told me about a transfer port limiting screw that could be turned out to increase the velocity of the rifle. I was unable to locate it from his description, and we went back and forth several times before I found it. At least, I thought I’d found it. Therein lies the huge mistake I made, and the save made by the chronograph, all of which should be a good lesson in pneumanology.

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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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Air Arms S400 MPR FT: Part 3

by B.B. Pelletier

Part 1
Part 2


The Air Arms S400 MPR FT is a beautiful international-class field target rifle.

Today, we’ll test the accuracy of the Air Arms S400 MPR FT precharged pneumatic air rifle, and it’s a challenging test because I shot this 12 foot-pound rifle at 50 yards on a day with 20 mph winds. The wind was from my 6 o’clock, and the trees created some swirls. I had to wait out the gusts and shoot in relatively calm periods.

However, before I begin today’s report I’ll rant a little. I was testing several things last week and someone asked me to test his Talon SS. He claimed he could not shoot groups smaller than 2 inches at 30 yards and most of his groups at that range were four inches. Well, I’ve never seen a Talon SS that shot that bad; even the one with the only Lothar Walther barrel I ever condemned in my three years at AirForce.

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Air Arms S400 MPR FT: Part 2

by B.B. Pelletier

Part 1


The Air Arms S400 MPR FT is a beautiful international-class field target rifle.

Today, we’ll look at the velocity of the Air Arms S400 MPR FT rifle. I’m testing the gun just as it was sent from the factory, which is how I would use it for field target. By looking at the large reservoir tube and knowing that this is a 12 foot-pound rifle, I knew it would get a lot of shots per fill, so today I concentrated on what the gun could do in factory trim.

Blog reader Coax has asked me to try to increase the power, to see what the potential of the rifle is. I’ll do that in a separate report because I don’t want to shortchange today’s lesson. And, a lesson it will be, because the unregulated MPR FT has the classic inverted bathtub curve of power as the air charge bleeds down. I want to talk about that, because it illustrates a couple of important points that new PCP owners need to understand.

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Air Arms S400 MPR FT: Part 1

by B.B. Pelletier

Before we begin, there are a couple of items to be addressed. First, Edith and I noticed that several of our readers are fans of the Three Stooges, and we thought we would share this photo we had taken in Las Vegas, when Edith, Mac and I attended the 2008 SHOT Show.


Left to right — Tom, Edith, Mac. This was the most fun picture we ever took. It hangs in Edith’s office.

Now, there is a survey to re-name the Air Arms Twice air rifle, and with a name like that I can see why. Go here to select suggested names or submit one of your own.

Next, the blog discussion about muzzlebrakes and the lack of open sights on many Beeman guns has resulted in two reader surveys. Go here to comment on the R7 air rifle. Go here to comment on the R1, R9, HW97, RX-2 and R11 air rifles.

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