Going to be lots of MPA chassis in the PRB stats this year.

Not familiar with the K.S. stock.

None of these stocks or chassis really have an advantage over each other when it comes to prone shooting off a bipod. Maybe from a rest for F-Class, but off a Harris with a small rear bag there isn't any difference. What separates the MPA chassis from others is that they have come up with some innovative things that make shooting off of barricades and various things easier and more accurate.

The barricade stop for example:
[youtube]6HPi5vJgNjg[/youtube]

When you lock this thing in, it's almost like shooting prone. When I've tried them, the crosshairs were maybe moving around 1-2" at 400 yards shooting standing of a VTAC barricade. And it works on angled shots and on things with all kinds of thickness.

I was at this match in Florida in the spring:
[youtube]vYUGHYouAhA[/youtube]

The guys with the MPA chassis rocked that stage. It was 10" round plate moving at just over 2 MPH at 500 yards out the window of that bus. For comparison, the DCRA mover is a Fig.11 (way bigger) going 1.5 MPH at 400. It is shot from prone.

They had another stage where we had to shoot life size prairie dog poppers at 300-400 yards off a fence. This is the guy who came in second at MLRSC (before he was on Team MPA) shooting it with his Manners T4.



Most of us with regular stocks were getting 0-2 out of 10 hits. Guys with the MPA barricade stop were getting 7-8 hits.

Now he's come up with a versatile rail that lets you mount the bipod close to the magwell for shooting off of barrels and other things.
[youtube]WHk8DwvsFzk[/youtube]

That really helps shooting off of narrow things. Once it's adjusted, it's a half turn on each screw to put on the rail or take it off. He sells a mount that lets you convert the Harris to picatinni mount like the Larue version.

The rear monopod can also be set on a 45 degree angle, which also helps support the rifle on odd things. And he has added a magwell cutout on the side that lets you change the mag quickly, but doesn't compromise the front and back support of magazine.

In order to compete with the MPA in PRS type shooting, other manufacturers are going to have to come up with things that help the shooter in non-prone positions. There is a lot of room for innovation. Making this stuff tool-less for example. And there are other problems like trying to shoot through openings like holes that are only around 2.5" high.

I'm still waiting for someone to create a buttstock that is solid but lets you adjust LOP on the fly like an AR carbine stock...
 
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Loopholes lol, or how not to shoot your chrony. Something that is difficult to get a brain around until one calculates it or zero/drop charts it.

I was still a little nervous about my numbers Friday morning shooting thru the chrony to 322 meters.

Anyway, a really well thought out chassis with real world usable features, I just need to decide which action to use in it.
 
Now that is what I am talking about. Thanks for the great info. This should be a sticky kind of thread for those wishing to pursue this style of shooting. Jefferson
 
Someone could come up with an aftermarket version of their push button barricade stop. It wouldn't be hard to install on any desired rifle.

Can't see it adding much weight either.
 
Got my MPA chassis. Just has a regular AR grip on it, which I absolutely hate because it puts the trigger at the first joint on my finger. It will be replaced. But, even with that, I can see the advantages after playing with the chassis some more. Stable crosshairs with a crappy trigger reach trumps a good trigger reach with crosshairs moving around more. On many barricades, I was able to get as stable or more with the MPA wedge system as with the Gamechanger bag. On hard rectangular stuff like 2x4s, I could get stable quicker and had less crosshair movement provided I had the barricade stop in the right position.

The barricade stop works on a variety of things. Anything that has a somewhat parallel edge: wood fences, top of walls, window ledges, posts (square or round), round bars or tubes that have a radius smaller than the height of the barricade stop. I got it to work on the edge of an open 45 gal drum putting a block between the barricade stop and the drum to take up the space. It worked on car doors in both directions (with the glass rolled down). If I put it on my tripod rest, perpendicular to the way it is in this picture and use the barricade stop, I can stabilize the rifle better than I ever could sitting the rifle in the channel of the rest.

Barricade stop that comes with the chassis isn't the greatest. It is thinner and more narrow that their "offset" one they sell, which is the one I've played with before. The offset one is wider and the pin is offset, so you can get different adjustments by rotating it and can use the wedge system on thinner barricades because it is wider (so when you turn it 90 degrees it's edge is closer to the magwell).

There is a bit of a technique to using the barricade stop. It has a bit of up and down play in it, so you have to take up the slack in the direction pressure is being applied to it to get it really solid. But, once you get the hang of it, it is easy to lock it in. I feel like it would benefit from being grippier or biting into the barricade a bit. I'm going to try adding some rubber, grip tape and cleats to see if it helps.

Magwell cutout is a double edged sword. Definitely an advantage in changing mags in the prone position. You can change a 10 rd. mag with the 4 rd. MPA extension on it without having to lift the rifle up (something I had to do with my A5 with Stealth bottom metal). It does have the disadvantage of limiting your panning in the opposite direction the cutout is on. You can't make as much of an angled shot without re-adjusting the barricade stop as you can in the other direction.

Have a monopod coming which I want to re-engineer to be quick-adjust and to have the ability to set parallel to the barrel to use as a bag rider in prone. Think that will be more useful than the bag rider plate that came with the chassis.
 
Also got the DLOC-S picattinni mount for the Harris bipod.

DLOC-S-Harris-SARG-aa.jpg


It works very well, but it does raise things up about 0.2". This can be negated if you get the spigot mount, which also puts the bipod a bit further forward. I think I like the SARG knob better than my podloc since it is symmetrical. Sometimes the podloc gets moved when bags like the gamechanger hit it.

Think the image above is mirrored because the lock nut is on the opposite side on mine.
 
[youtube]s9z8CQ21RL4[/youtube]

Used the wedge lock system at the Lone Survivor match this weekend on a round fence. Cleaned the stage easily.
 
Did some testing prior to leaving for the match.

Here is my rifle locked onto a round fence pole:




Shot at 346 yards hitting a 6" plate easily. Then moved to 824 yards and had no trouble nailing a full size IPSC several times. Then I went to 1098 yards. First and second round hits (top right quadrant)

 
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