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Home :: Adjustable Bag Rider :: Flat Mount Adjustable Bag Rider by Long Shot Precision

Flat Mount Adjustable Bag Rider by Long Shot Precision

Flat Mount Adjustable Bag Rider by Long Shot Precision
MPA BA Adjustable Bag Rider MPA BA Adjustable Bag Rider MPA BA Adjustable Bag Rider MPA BA Adjustable Bag Rider MPA BA Adjustable Bag Rider ORYX Chassis Adjustable Bag Rider MPA BA Adjustable Bag Rider
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The Adjustable Bag Rider (ABR) is made locally and assembled in the USA. Made out of the highest quality American aluminum, CNC made and anodized for superior wear resistance, the ABR is made to last and weighs less than a pound. The custom dowels come in either hardened alloy steel or stainless steel and ride in linear bearings for consistent smooth operation. A custom-designed SS thumb wheel rides in two Delrin thrust washer that are known for their strength and creep resistance. The ABR replaces the need for expensive, heavy, and bulky adjustable front rests and wobbly monopods. It is the only bolt-on enhancement that provides vertical adjustment while providing horizontal stability without requiring positional body changes. Installation is simple, quick, and you never need to remove it.

Direct Bolt-On Applications:

  • MPA BA, Hybrid, ESR and Bergara Premier Competition with the MPA chassis (short dowels) models and is supplied with the proper length bolts. The two-step aluminum cross stud for the monopod (the Bag Rider Barrel) will be used for the longer front mounting bolt. While the ABR is opened, start the two supplied bolts with your fingers - finish tightening with an Allen wrench. DO NOT take apart the ABR. There is a short 1/4-20 bolt installed in the ABR that has to be removed for applications other than the MPA chassis.

Modifications required:

  • ORYX Chassis: (long dowels) If your chassis does not have the M-LOK slot it is suggested to reduce height added to the rear of the stock that you directly bolt the ABR onto the lower stock without adding a Picatinny rail since machining is required either way to add the bolt holes. The Flat Mount ABR has two small slots and counter bored areas for the bolt heads to be recessed. (see picture)
  • XYLO Chassis - (short dowels). The lower rider (part of the stock) will need to have bolt holes added to mount the Flat Mount ABR (which already has two small counter sunk slots).
  • MPA - to fit the long dowels, the rear dowel will have to pass into the stock so milling a hole is required (see picture with BLACK stock).
  • Sig Cross - The rear stock must be modified to the the ABR and the holes milled in the ABR to clear 10/24 bolts. Please contact us for details. The LOP plate must be modified to clear rear dowel. (see picture). see Installs page
  • MPA Matrix - Custom installation (milling required)  - see Installs page
  • Tubb Rifles - (long dowels) contact for information
  • Daniel Defense Delta 5 Pro - see Installs page


  • CNC'd American 6061 Aluminum
  • Class II Anodizing
  • Clamp to lower Picatinny rail
  • Unequaled ease in vertical adjustment in micro intervals
  • No need to purchase expensive and/or heavy front rests
  • Rock solid horizontal stability - no wobble
  • Reduced load development time
  • No more squeezing a bag - reduces vertical dispersion
  • Faster follow up shots
  • Straight tracking
  • Includes Rail Clamp and 10-32 bolts - torque to 18 inch-pounds
  • Weighs less than 16 ounces
  • Two bottom rider options are available - V bottom or ELR
  • Not sure which ABR will work for you? Contact us with questions 970-672-0765.

Caliber Restrictions: 

  • .338 and smaller will use the standard dowels
  • .33XC and larger need the Hardened Dowels 

The two lower riders (ELR bottom or V bottom) are designed to provide optimal performance when used with a rear bag with ears. No need for positional changes to the rifle and body which cause point of impact inconsistencies. Say goodbye to the mound of expensive and heavy equipment you take to the range. Whether you plan to go to the bench or want to take a shot in the field you are guaranteed to have previously unattainable stability and micro-adjustment with you at all times!

The ABR is designed to work with a rear bag and any bag or sand sock can be used - but a bag with ears works best. Bags with bunny ears allow full access to the thumb wheel at all times. If a heavy leather bag is used and there is space in between the ears and the rider the groups will be horizontal. If there is a space, remove the ABR from the bag and, pushing down with your thumb on the top of the ears to shrink the space between the ears. if all space cannot be removed a shim can be tested. For example, lay a piece of leather across the top of the ears and push the ABR down on top of it. 

Long Shot Precision (LSP) has worked closely with the Protecktor Model company to develop the "round back" rear shooting bags. These bags have been collaboratively designed for use with the ABR to maximize clearance from the thumb wheel to the front of the bag ear. We recommend you call Protektor Model and let them know which ABR you've purchased and the height you need and they will guide you to the best Round Back Bag. 


**Do NOT lower the rider past the dowels being level with the top of the ABR. Please note this product does NOT fit all MPA stocks or for the Oryx anything other than the MDT with a mounting slot.

 **Please allow a week before shipping in some cases. 

 Non-Affiliation Disclaimer: LSP is NOT affiliated, associated, authorized, endorsed by, or in any way officially connected with the MasterPiece Arms Holding Company or Modular Driven Technologies brand.


Average customer rating:
(1 reviews)  

1 Most useful customer reviews (see all reviews):
Russell J
Dec 1, 2022
This is what I’ve been wanting for as long as I’ve been shooting. No more squeeze bag. This thing is super find adjustable and SMOOTH! Highly recommended! I have a myopathy in my hand and this is a life saver. Had my shooting partner tried it out and he was sold after the first shot. Quality is first rate and installation took 10 minutes.

Advantages: No more squeeze bag! If yer a bench shooter or F class shooter this is fer you. For competition or just shooing fer fun.
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