MPA BA Custom Build Rifle

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The MPA BA Custom Build system gives the shooter several options to help design an ultra precision long range Rifle. Just pick your action, barrel, trigger, color and specify your caliber and chamber.

You can also add our mount, optic and choose to have the rifle “range” ready, including barrel brake in, zero and load development.

For load development, we will discuss the specific objectives of the customer, including a variety of factors. The rifle will be delivered with 20 rounds, fine tuned to match your rifle, including a report showing brass type and prep methods, primer type, powder type and weight, projectile type and weight, plus projectile loading depth and ogive location. We will also include a Hornady OAL gage, Bullet Comparator, a set of calipers.

Each rifle is finished with Cerakote in a variety of colors, including the barrel and action.

Availability/Delivery: Depends on the configuration. If the chamber/caliber is one of our standards, such as a 308, 300WM, 338 Lapua, 6.5 Creedmoor, 6.5×47 Lapua, 243 or 6mm Creedmoor, the delivery will be within 6-10 weeks or sooner. Other caliber configurations could take longer. Just contact MPA for details.

Action Options:

Defiance Rebel – Available in Short, Long and XL sizes.

Defiance Deviant – Integrated Rail and Recoil Lug in short and long action sizes.

Stillers TAC Series – In short, long and 338 Lapua Actions

Kelblys Atlas Tactical – Short and Long Actions

Big Horn – In Short and Long Actions, and soon the new Tactical Action, include several upgrades, including a control round feed system.


MPA/Spencer Barrels – available in a variety of Contours, these 416R Stainless Barrels are handlapped to perfection. Checkout the link above for more information about these barrels.


Jewel HVR

Timney Calvin Elite – 8oz – 2lb pull

Timney 611 – 1.5-4 lbs pull – used only on the Howa Actions

Rifle Basix L1 – 1.5-4lbs pull

Rifle Basix LV1 – 8oz – 2 lbs pull

Chassis System:

There are 3 different chassis options for your custom build.

MPA BA Chassis

MPA BA Competition Chassis

MPA BA Lite Chassis


All Builds in 6.5mm or smaller carry a 3/8 MOA Accuracy Guarantee

All Builds larger than 6.5mm carry a 1/2 MOA Accuracy Guarantee

Caliber, Chamber and Twist Rate

Calibers and Chambers and Twist Rates: At the time of order, please specify your perferred caliber, chamber and barrel twist rate. Click here for our available options.  Or simply contact MPA with any questions regarding these options.

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Additional information



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Barrel Contour

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