whats the best caliber barrel to put in a masterpiece arms chassis

This article originally appeared in RECOIL Result 40

MasterPiece Artillery Bolt-Action Competition Chassis Does What Others Can't

The word innovation gets thrown effectually a lot, but MasterPiece Arms is one of the few companies putting innovation into action on a continuous basis. MPA has modernized its commodities-activeness chassis with a fiddling luck and a lot of listening.

When Phil Cashin bought MPA in 2008, he had a different vision than the path the visitor had been trotting along. Cashin took a hard right turn into the precision rifle market, which was a surprise to those of u.s.a. who knew the company for their semi-auto trailer trash Uzi clones. MPA chassis are now the most-used chassis by precision long-range competitors, according to a Precision Burglarize Series survey. And, most of the improvements to MPA chassis have come up every bit suggestions from competitors.

If y'all're familiar with shooting a traditional stock, the MPA chassis might seem like a production from the infinite age. But nosotros've officially been in the infinite age since 1957, so just go with the period and be open to trying out a new organization. Machining a chassis instead of dealing with expensive and time-consuming molds in the manufacturing process provides nearly limitless opportunities for iterative improvement. In the case of the MPA BA Competition Chassis, it rocks more capabilities than any other stock or chassis currently on the market.

Lucky by Pattern
MPA's first chassis was designed in 2014, and it was an eyesore. Hints of the original chassis can be seen in the new MPA BA Competition Chassis. The skeletonized design of the new chassis is purpose-built; every aspect of the chassis makes shooting either easier, faster, or more authentic.

Cashin said he got lucky with the outset chassis design because it's immune for backward compatibility. "The base system of our chassis hasn't actually inverse over the past four years. Nosotros're operating from the standpoint that nosotros desire our technology to be backward compatible," says Cashin. "So a client who bought a chassis from us 4 years ago doesn't have to feel obligated to spend $i,000 on a new chassis."

In part because old MPA chassis don't need to dice when a new feature is unveiled, Cashin garnered a loyal customer base. If a customer bought an older MPA chassis, he can send it back to MPA for upgrades at a minimal cost — all it takes is a motorcar time and the sometime chassis is the hot new, new.

Key Features
MPA chassis are machined from a unmarried piece of 6061 aluminum. The only role of the chassis that'south removable is the buttstock, which tin can be swapped from stock-still to folding. Shooters with a need for a folding stock can social club it instead of having the fixed stock. The downside of a binder is that its moving parts create a pocket-sized opportunity for failure. If y'all don't need a folder, stick with fixed. We like the idea of easier travel and not having to remove our tin, and so nosotros opted for a folder to salve space in the gun case.

Folders are functional, if you lot actually apply them.

There are several aspects of the MPA BA Contest Chassis that ready information technology apart, so much then that other companies have at present began to copy MPA's homework. The most notable and about copied feature is the machined Arca-Swiss cut direct into the chassis. Later MPA started cutting a dovetail into the chassis, several other companies have done the aforementioned, or offered an aftermarket Arca-Swiss plate that can be attached to the rifle. An Arca-Swiss way dovetail allows the burglarize to be fastened direct to a tripod. In many cases, shooting off of a tripod is as stable as shooting prone.

Discreet machining along the forend is a huge part of MPA'southward success in the precision rifle arena.

The dovetail cutting mates up with MPA'south Rapid Aligning Technology (RAT) line of accessories. MPA RAT adapters allow for the shooter to quickly move a bipod along the length of the runway. This is beneficial for awkward shooting positions, like shooting from the top of a 55-gallon drum. Past moving the bipod dorsum, yous can build a more stable position with both the bipod and rear bag in contact with the pulsate. Because the RAT system is so like shooting fish in a barrel to adjust, moving the adapters can be completed while on the clock.

MPA's spigot mountain comes in two forms, Picatinny or dovetail. Past extending the real estate of the forend, the spigot mount gives you some other spot to mount a bipod. Mounting the bipod to the spigot leaves the rest of the forend for use with the RAT system or tripod.

Forth the bottom of the rails are multiple holes, and while it may seem like aesthetics or possibly weight-reduction, there's a purpose. I of the most-used MPA accessories is the barricade stop. With a push of a button, you tin move the battlement stop along the length of the forend past putting it into any hole. Having so many options for the barricade stop lends to much more stability and less wobble when shooting from barricades of any width.

Having a barricade stop improves stability.

Originally, MPA chassis shipped with an angled AR-manner pistol grip. Most shooters would place their pollex on the thumb residual that's machined into the chassis. Cashin realized that using an angled AR grip caused undue tension in the shooter'due south wrist. After over 30 versions, the Enhanced Vertical Grip (EVG) was born. The EVG is comfortable to use because it has specific areas to support your thumb and trigger finger. Having a steady simply not stressed grip helps mitigate the shaking that occurs from hand tension. The EVG is the virtually comfortable detachable grip we've used for long-range shooting.

Adding weight to a rifle helps manage recoil. Some shooters hollow out traditional stocks and add weight at specific points to better remainder the rifle and lessen recoil. When Cashin saw a shooter at a match adding weight with shotgun pellets in his stock, Cashin had an epiphany. A low-profile weight organisation was designed for the MPA systems. The Weight Tuning Kit can add a full of 4.4 pounds or as fiddling as one pound. Weights adhere to the forend or buttstock. Calculation the weights is as simple as removing whatever is in the way and putting the burglarize back together; it'southward as like shooting fish in a barrel as Legos. Once installed, the weights look like they were part of the burglarize the whole time.

Measuring muzzle velocity using a chronograph is a necessity for precision shooters. We use it to predict the vesture on the barrel, and also as one of the many variables for ballistic engines. Knowing the muzzle velocity helps you lot gather the gun data instead of having to certificate data on previous engagement. Many competitors travel with a MagnetoSpeed chronograph and recheck the muzzle velocity at matches. The trouble is that the MagnetoSpeed is ordinarily hung directly from the barrel, which shifts the bespeak of impact. So those rounds cannot be used to confirm null or information. MPA built a solution, the RAT MagnetoSpeed Adaptor. By attaching the MagnetoSpeed to the dovetail version of the spigot mount, information technology doesn't come up in contact with the barrel.

No more barrel shift when chronographing, thank you to the MPA RAT MagnetoSpeed adapter. (Archived chrono information shown.)

Rarely practise competitors have to do a magazine alter in the center of a phase. Just if information technology has to be done, it better be as efficient as possible so you're not fumbling around with a mag. Cashin worked with pro shooter Ryan Castle to develop what'south known as the Ryan Castle Magazine Cut. The left side of the mag well is cut, making popping a new mag in faster than the standard cut where you have to perfectly align the magazine and ease it in.

With the release of the Competition Chassis, MPA nixed the rear monopod that's establish on other MPA chassis. Instead, a Bag Rider or an Enhanced Bag Rider comes installed on the chassis. The Pocketbook Rider extends the bottom length of the buttstock and the enhanced version is fifty-fifty longer. This feature goes hand-in-mitt with a rear bag. Shooters tin can move the rear handbag forwards or rearward to adjust the elevation of the muzzle. A rear bag used in this manner allows for large and small adjustments, so you tin become stable on your target and have minimal wobble.

The bubble level is in an ideal location for a quick peek to make sure the burglarize isn't canted.

The last key feature of the MPA BA Competition Chassis is the inclinometer leveling system. In layman'due south terms, it's a bubble level. Even a small amount of deceit can put your impacts off target. Many long-range shooters install aftermarket bubble levels on their rifles. With the integration of a level in the MPA chassis, you can see if the rifle is level without taking your face off the cheek-piece.

But Look, There'southward More

Chassis fans choose chassis for their adjustability and modularity. Non-chassis shooters end up seeing the calorie-free once they get some time behind a well-designed chassis. Many chassis have like features, and that's what we similar almost these systems. Nosotros like that yous can adjust the length of pull and cheek-piece and make adjustments on the fly.

Fifty-fifty though information technology'south not necessary, y'all can glass bed the action and barrel thanks to the V-Bedding system. A Picatinny bridge at the forepart of the chassis gives a base for mounting night vision or other electro-eyes. There are 6 QD hinge locations, four on the buttstock and two toward the front of the forend. The adjustable buttstock provides a length of pull betwixt 13.75 to fourteen.75 inches and the pad on the buttstock tin be tilted and moved to ensure the best fit for you lot. With a plow of a wheel, the cheek-slice moves up and down. Having an adaptable cheek-slice is often disregarded by shooters, but it's the secret to getting consistent eye relief each and every time you lot put your caput on the rifle.

An extended bag passenger is the perfect mate for a rear bag.

The MPA BA Competition Chassis accepts a gamut of pop actions and information technology's even available with left-handed options. All MPA chassis are finished in Cerakote; the standard colors available are blackness, burnt statuary, apartment dark earth, gunmetal, marine red, NRA blue, sniper green, and tungsten. Custom finishes are available; you just have to contact MPA.

With all this practiced, there's got to exist a petty chip of bad. Fortunately, the bad isn't a deal billow. The screw sizes aren't the same on the chassis. This makes sense since some parts need larger screws for their strength.
To remove and replace accessories, you amend have a mini
toolbox. We had a set of Fix Information technology Sticks, which had all the $.25 nosotros needed. For example, the spigot mountain needed a one/8 bit, while the Pocketbook Rider needed a T-25, the Nighttime Vision Bridge needed a T-15, and the Weight Tuning — nosotros think you become the idea. Simply once you take your burglarize put together the way yous want, having all the bits and playing gun Barbies, swapping out pieces doesn't have to happen unless y'all want information technology to.

Shootability

To test this chassis, nosotros wanted to burn down through a lot of ammo and take fun while doing and then. We opted to put a Vudoo Gun Works V-22 barreled activeness in the MPA BA Contest Chassis. The V-22 came with a Timney Triggers Calvin Aristocracy Custom Remington Model 700 trigger. We topped the burglarize off with a Nightforce 5-25 ATACR with the new Mil-XT reticle. You can read more near the V-22 and the Mil-XT in split up articles in this issue. And, as ever, we run suppressed when possible, so we put an Acadian Armament Lynx silencer on this build.

Nosotros wanted to shoot this gun until nosotros ran out of ammo. The V-22 is chambered specifically for Lapua 22LR, so we just shot most 500 rounds to forestall breaking the depository financial institution. Lapua ammo is known for shooting well, but it's more expensive than the average 22LR you'll find at Walmart.

We could sum up the shootabilty of the MPA BA Contest Chassis with one discussion: piece of cake. It was quick to suit the fit between different shooters despite varying in size. The options seem to be endless, and we expect that by the fourth dimension this article goes to print, MPA will accept a handful of new accessories or upgrades for this chassis.

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