Posts Tagged ‘Benjamin Marauder Woods Walker pistol’

R.A.I. adjustable AR stock adapter: Part 2

by Tom Gaylord, a.k.a. B.B. Pelletier

Part 1

Today, I’ll begin testing the R.A.I. AR adjustable stock adapter from rarmsinnovations.com with the UTG Pro 6-position adjustable stock attached to the Benjamin Marauder pistol.

Length of pull
Before we begin, I want to say a word about the length of pull you get with this adapter. I gave the range of lengths in Part 1 as 14-1/8 inches to 17-1/8 inches, and that turned off many readers. In terms of conventional stocks, that pull range is very long! But Dave Rensing, who invented this adapter, made it for his 8-year-old son and his 7-year-old daughter. The son uses it conventionally, but the daughter collapses the stock past the first detent so it’s even shorter. Fully collapsed, the pull length measures exactly 14 inches but feels like 11 inches.

The AR adjustable stock is not very ergonomic. It stretches and contracts okay, but it doesn’t move in the other directions. It’s a one-size fits none kind of deal — at least from a rifle marksmanship standpoint. While it works very well for fast maneuvering and climbing in and out of tight places, your body has to adapt a lot to make it work.

On the other hand, when the R.A.I. adapter is added to it, the stock becomes almost universal! You can adjust the positions of the comb and the angles of the buttstock through a wide range of attitudes and make it fit almost anyone — young or old. I found when shooting from the bench that even the 15-1/8-inch pull I had initially set up was too short. I had to move the stock back until the pull was 15-7/8-inches before it felt natural again. However, in the offhand position, the 15-1/8-inch pull is the right one. That demonstrates why the adjustable stock works so well on this pistol! You can adjust it to whatever you need in the blink of an eye.

I discovered why this is. The AR adjustable stock has no width. The narrow tube is where your cheek rests, so your eye is closer to the centerline of the pistol than it would be with a conventional stock. The stock also does not drop at the butt, so your head thrusts forward farther than it might with a conventional stock. Instead of sticking up to rest on the cheekpiece, your head tilts forward, along the straight tube. Hence, 14 inches feels more like 11 inches. The Marauder’s pistol grip and close trigger enhance this feeling.

Benjamin Marauder Pistol Tom holding offhand
Here I’m holding the carbine offhand. The pull seen here is 15-1/8 inches, and yet the rifle feels perfect. You can see that my head has gone forward on the stock because it’s so straight.

Scope and mounts
I wanted to test the pistol with a really good scope; and the last time I tested the Marauder  I used a CenterPoint 3-12X44 compact scope. Leapers was making CenterPoint scopes back then, so this time I attached a UTG 3-12X44 compact scope. My scope is older than the one I linked to, but the optics and overall size are the same. Not only does this scope fit the carbine very well, it gives a crystal clear sight picture that makes aiming so easy.

I needed to get the scope high off the receiver because the Marauder pistol has a circular 8-shot magazine that sticks up above the receiver top. You can see it in the above photo. Also, the stock’s straight line puts my head higher than it would normally be. So, high scope rings are in order. I selected a pair of BKL 30mm high rings that have a single-screw top strap. The Marauder pistol doesn’t recoil, so these rings can be made thinner and still be strong enough to hold this scope. Once they were mounted, I noted they brought the scope’s exit pupil directly to my eye, making them the perfect height.

Testing the Marauder carbine
I tested this Marauder pistol extensively, back in 2010/2011. I already knew the right fill pressure (2,900 psi), the best pellet (.22-caliber Beeman Kodiak) and the effective number of shots per fill (32). Since it has an 8-shot magazine, I shot 8-shot groups instead of 10.

Sight-in went quick, and then I backed up to 25 yards and started shooting. The first group of Kodiaks was the second-best of the session, putting 8 into 0.554 inches. Looking back at the tests I did years ago, I wasn’t shooting as well on this day as I did back then. I shot a total of six 8-shot groups, and the largest one was 0.607 inches, while the smallest was 0.504 inches between centers.

Benjamin Marauder Pistol first group
The first group was 8 Kodiaks into 0.554 inches at 25 yards.

Benjamin Marauder Pistol largest group
The worst group of the day was 8 Kodiaks in 0.607 inches at 25 yards.

Benjamin Marauder pistol smallest group
The best group of the day was 0.504-inches for 8 Kodiaks at 25 yards.

While these groups are okay, they aren’t as small as the groups I shot previously. I don’t think it was me or the gun. In this case, I think it was the pellet. I used a different tin of Kodiaks in 2010, and they grouped much tighter in this pistol than these did. The best group back then was 0.405 inches between centers. Maybe they had larger heads, or maybe they were just different in some unquantifiable way.

Other pellets
I tried a number of different pellets in the Marauder pistol, but none of them did very well. JSBs of various weights, which I thought would do well, sprayed all over the place. I know from testing the gun that it wants a fat pellet, and the Kodiak is a good one for that. It’s slow, at an average 584 f.p.s., but even at that it produces about 16 foot-pounds of muzzle energy. That’s pretty good for an air pistol! Certainly enough for some hunting and pest elimination.

The rest of the test
I plan to take this pistol to the 50-yard range, so you’ll see the results of that. But I don’t think that’s quite the right way to test the R.A.I. adapter and adjustable stock. We already know how well the pistol performs. Now, we want the focus to be on the adapter and the stock.

Maybe I can put the gun in the hands of some other shooters and see how well it fits them. Perhaps, that’s the best way to evaluate this item. I don’t know, but I guess we’ll see.

R.A.I. adjustable AR stock adapter: Part 1

by Tom Gaylord, a.k.a. B.B. Pelletier

Wives, I want to warn you — today, I’m going to be The Great Enabler! Last year, I was sent a product to test for Pyramyd Air — an AR stock adapter for certain Crosman pistols by R.A.I. It lets you turn a pistol like the Benjamin Marauder into a carbine by adding an M4 telescoping stock to the back of the gun.

Why?
But why would you want to do that? Well, Dave Rensing, the owner of R. Arms Innovations — rarmsinnovations.com — wanted to do it so his young son could shoot his Marauder pistol. The big pistol is heavy for a youngster, especially when it has a scope mounted; but with an adjustable carbine stock, the youngster can size it to fit and then rest it on any convenient place and shoot it like a rifle. And because the M4 stock adjusts for length of pull, Dave can adjust it for himself in seconds. If 2 or more people can shoot the same airgun, the $400 price tag gets spread around and diluted.

The Marauder pistol does come with a factory shoulder stock that turns it into a carbine, so what does this adapter do that the factory stock doesn’t? It all comes down to adjustability. The R.A.I. adapter allows the adjustment of the stock to a wide range of positions that should fit most shooters. Not only is the pull length adjustable because of the M4 extendable stock, you can also raise and lower the stock line (the amount of comb drop), which affects the height of the butt; and you can have a wide range of cast-off and cast-on stock positions (where the stock angles away from you or toward you). And it doesn’t end there. You can also rotate the angle of the butt from straight up and down to where the toe is slanted in toward you or out, away from you.

The R.A.I. adapter helps make the Marauder pistol (and some others others I’ll mention later) into a small carbine that fits the shooter. And let’s not forget that it attaches to a telescoping M4 stock. What that does will differ with each brand; but for this test, I’m mounting a UTG PRO 6-position mil-spec stock assembly that has 6 different lengths of pull. On my test pistol, the length of pull runs from 14-1/8 inches to 17-1/8 inches. This is a rare occasion where I find the length of pull is adjustable to my liking!

The R.A.I adapter
The R.A.I. adapter is made in 3 pieces. Two are machined aluminum, and the third is the bolt that holds everything together, plus attaching it to the gun.

RAI adapter view 1
The R.A.I. adapter consists of these 3 parts.

RAI adapter view 2
This view reveals the essence of the R.A.I. design. That elongated hole, which can be positioned at any angle around a full circle, allows the smaller piece to slide out to the edge of the larger piece.

RAI adapter bolt
The bolt fits through both machined pieces and threads into the hole at the back of the Marauder.

RAI adapter installed
Here, the adapter is installed. The bolt runs through both machined pieces and fastens them to the pistol. The smaller piece fits over the Marauder end cap.

RAI adapter view 1
That elongated hole in the large piece allows the adapter to be rotated up.

RAI adapter rotated down
Here the adapter is shown rotated down. It can be rotated to any position around a full circle!

The stock
Now that you understand how the adapter works, let’s look at the stock that attaches to it. I used a UTG PRO mil-spec stock assembly that has 6 positions for length. The mil-spec designation means the stock tube size conforms to military drawings.

This stock comes from Leapers as a complete package that’s ready to install. The buffer and buffer spring are shipped inside the stock but are not needed for the airgun application. The flange that locks the stock to the AR receiver to prevent it from rotating on the firearm can also be removed.

Leapers AR extendable stock
The Leapers UTG extendable AR stock comes complete and ready for an AR. The buffer, buffer spring and stock flange can be eliminated for this application.

When the stock is screwed into the adapter, the castellated locknut that tightens the stock can be used to lock it in any orientation you want. Regardless of how the adapter is positioned, the stock can be snugged down. This makes the R.A.I. adapter a very adjustable item!

Leapers AR extendable stock locknut
This castellated locknut allows you to lock the stock in any position. The adapter can be rotated however it suits you, and the stock can then be locked to it in any position.

I found this adjustability to be a blessing! As I’ve mentioned more than once, I usually have to adapt to the rifle I’m testing because not many rifles adjust. Most stocks are too short for me, and most combs are too low. I’ve learned to put up with just about anything to get the job done, but it’s rare that I get to shoot a rifle that actually fits me. This R.A.I. adapter may change that with the Marauder pistol.

I’ve now adjusted the stock so the gun comes up fast and feels fine against my shoulder. I won’t know for sure if I have it adjusted right until I shoot the carbine several times — so guess what’s coming?

Leapers extendable stock mounted
With the stock mounted, I find that I can position it exactly as I like it. This might work!

I was surprised to find that the stock’s pull was 15-1/8 inches when I had it adjusted the way I like. I always knew that I liked a longer pull, but this was even longer than I’d suspected.

I also have the comb’s drop set at the maximum; but since this is a straight-line stock, it’s perfect. The cast is set straight for me. And I have the toe of the butt canted into my collarbone. It will require some shooting to establish if this is the best fit for me, but right now it feels good.

What else will it fit?
Besides the Benjamin Marauder this adapter also fits the Crosman Silhouette pistol, the Crosman 1720T PCP Target air pistol, and the Benjamin Marauder Woods Walker. These PCP pistols are all expensive, so the R.A.I. adapter offers a way to expand the utility of each of them across a wide spectrum of shooters.

Is it worth it?
The R.A.I. adapter costs extra, and so does any extendable AR stock you’ll need to purchase with it. The Marauder already comes with a shoulder stock, so is this setup worth the extra expense? It is if you want your carbine to fit a lot of different shooters. If you want to share your carbine with your wife or your children, then this adapter makes that possible, with the gun adjusting to fit everyone. It’s also something to consider if the regular stocks don’t fit too well. I can’t say this one is universal, but it does cover a pretty wide ranges of needs.

What’s next?
This accessory is unlike what I usually test. I’ll be shooting the Marauder pistol to see if I like how the stock makes it shoot for me. That’s a little different than my normal type of test, but I think it should be very interesting and perhaps even informative. Stick around — there’s more to come!

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