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Does the A1 Upper Receiver Part# UR-01-E3, have an M4 style feed ramp.?

The A1 upper receiver part# UR-01-E3, does not have M4 feed ramps as it is made to print from the 50’s on the A1 Style Upper. We do hope to have A1 Uppers with M4 feed ramps in the very near future so if that is what you are interested in please check back.

–Added 10/19/18

Using MBA-3 with Savage Rifles?
Luth-AR Note on Savage Rifles:
Our MBA-3 was designed to fit standard Mil-Spec and Commercial Tubes. Savage tubes have been found to be oversized. You will need to purchase a standard carbine tube in order for this to pair correctly, otherwise you will find a very tight fit.
Can I use the MBA Buttstocks with the buffer tube that came with my gun??

Our stocks are designed to work with Mil-Spec and Commercial buffer tubes. While we cannot guarantee that all manufactures buffer tubes meet those specifications, the MBA stocks should work with the buffer tube that came with your gun. If you have an issue with the MBA stocks fitting your existing buffer tubes we offer buffer tubes and complete kits that meet the proper Mil-spec and Commercial specifications available.

Here are a couple of Tech Tips to help you with buffer tube issues.

Can I substitute the 3-axis butt plate for the one included with the MBA-1??

Absolutely, that’s what the Modular Buttstock Assembly is all about, Modularity. The MBA family of buttstocks is designed to “Have it your way”.

Charging Handle Clearance and MBA Buttstocks?

It has been brought to our attention through videos and blogs that there is a “design problem” or “quality issue” with our MBA Stocks as it pertains to the charge handle interfering with the MBA as you retract the charge handle…I can assure you that the MBA is manufactured based upon current military M16 drawings for the lower receiver and A2 butt stock and in fact meets those specs.

Unfortunately, there are several aftermarket AR lower and rifle makers that are machining the threaded hole for the buffer tube in the wrong position or too high, thus causing the charge handle to contact the leading edge of the MBA. There can be other factors that cause this problem such as after market charge handles that also are machined out of print and a true position issue on upper receiver dimensions.

To accommodate concerns, we have modified the tool to incorporate a flat on top of the MBA however this may not correct all of the aftermarket manufacturers.

Some customers have filed a chamfer on the leading edge of the stock or charge handle to allow for clearance.

Hopefully this answers any concerns about this issue.

The Set Screw on my MBA-3 or MBA-4 is different than the one shown on the website?

We have made a slight upgrade to the MBA-3 and MBA-4 stocks. We eliminated the “button head screw”, which is shown on website and on the instructions in photo #5 and replaced it with a headless index set screw.

*Both versions of the set screw work correctly so we will not replace either on past or current stocks.

*The current images on the website show the new set screw and the instructions included with the MBA-3 and MBA-4 have also been updated to show the new set screw.

What are the color choices for the MBA Buttstocks??

The MBA-1 and MBA-2 buttstocks are available in Black, Flat Dark Earth. The MBA-3 and MBA-4 are available in Black and Flat Dark Earth. Due to variations in different manufacturers color interpretations we do not claim that the color of our stocks will match other manufacturers. We maintain color consistency within our product line.

Barrel Break-in Procedure?
For best results we recommend following a break-in procedure. We recommend that you clean the chamber and bore after every round for the first 25 rounds. It should take approximately 200 rounds for optimum barrel accuracy. Please keep in mind that accuracy is dependent upon many factors such as bullet weight, powder load, etc. If you have any question regarding our procedure, please ask or give us a call.
Per ammunition guidelines it is not recommended to shoot 5.56mm in a .223 REM  barrel, which we support for best and safest use of our product.
Can I use the MBA Buttstocks on my State Restricted AR15??

We cannot advise you about any State or Federal Restrictions, it is your duty to assure what accessories or modifications are legal in your jurisdiction. We suggest that you research the laws prior to ordering.

My State doesn't allow the Length of Pull to be adjustable on my stock.?

While we cannot advise you about any State or Federal Restrictions, you can order an MBA-2 which has no Length of Pull adjustment. If you want the Cheek piece adjustment you can order a separate Adjustable Cheek Kit and add it to the MBA-2.

Alternately you can order an MBA-1 and order a fixed butt plate, A2 Screwbutt plate screws, and replace the adjustable butt plate.

Where and how are Luth-AR products made??

Luth-AR products are proudly manufactured and assembled in America.

Luth-AR does not use or sell MIM parts for the AR platform.

The following Luth-AR parts are investment cast utilizing mil-spec drawings for materials and heat treatment:

Trigger, hammer, bolt catch, apertures, selectors, rear base sight, as well as other components such as disconnectors, carriers, bolts, extensions, aluminum trigger guards, upper receivers (7075 T-6).
Our springs are a combination of 17-4 SST and various mil-spec steel wire are used in all of our springs with certification. The same applies for our gas rings and gas tubes.
How can I become a Dealer??

You can submit your information to apply to become a dealer here.

International and UK Customer – Shipping?

Luth-AR does not have an export license yet; however, if you are an International customer or specifically a UK customer you can find our products here:

International Exporter: 
Rainier Arms – Alex – alex@rainierarms.com


Suffolk Rifle Company – Neal – 7886 415303 – mail@suffolkrifle.co.uk
Riflecraft LTD – Jonathan – 1379 853745 – jonathan@rfilecraft.co.uk
Southern Gun Company – Bob Clark – 01208 857074
Amazon and eBay Purchases?

Purchase only Genuine Luth-AR Parts and Accessories. Caution should always be used when purchasing from unknown sources on Amazon or Ebay and others.


There are Luth-AR MBA Buttstock knock-offs being offered on some of these platforms. Warning signs to look for is that they may be labeled as “Luth Style”. These are of unknown quality, unauthorized and counterfeit products. They will not come in the correct packaging and will not have quality printed instruction manuals. They will most likely be offered at prices well below our advertised price. Some have actually stolen our published product images to further deceive the purchaser.

Here are some tips on what to look for:

  1. Red QD sling swivel cup
  2. No internal support ribs (4) on the inside of the buffer tube hole
  3. Back side of side struts lack reinforcement structure and are smooth
  4. Buffer tube hole undersized and is very tight on a Mil-Spec buffer tube
  5. No Luth-AR logos indicated on the buttstock
  6. Inferior polymers whereby stock will break easily
  7. Cap-head screws and Allen wrench are metric vs SAE
  8. Genuine Luth-AR buttstocks are packaged in a quality, printed box and include quality printed instruction sheets and brochures

It has also been brought to our attention that sellers on both Amazon and eBay sites are bundling and selling our butt stocks with aftermarket and foreign parts (such as the buffer tube, buffers, spring, etc.), that are not Genuine Luth-AR parts and are not made to original M-16/AR-15 specifications. Our butt stocks and parts are designed around those specifications. Some of these bundles may even use Air-Soft parts not suitable for use on a real firearm.

Please be cautious when purchasing, that you are purchasing Genuine Luth-AR Parts and Accessories. If you have any questions about yours or one you might be considering, please email or call us.