[SHOT 2024] Senex Arms MBLR-15 Bullpup Rifle

TFB Staff
by TFB Staff
Senex Arms’ MBLR-15

At SHOT Show 2024, Senex Arms introduced their Modular Bullpup Light Rifle 15 (MBLR-15). Developed by engineer Brandon Makowski, the company’s unique offering in the bullpup rifle category garnered attention for its versatility and use of familiar components.

Senex Arms' MBLR-15

On the SHOT Show floor, Brandon displayed a number of potential configurations for his design. The variations, which differ in overall length, handguard size, and barrel length, are each suited to different use cases, reflecting the modular nature of the MBLR-15. Among the designs presented were:

– A 28.1″ OAL model featuring a full-length handguard and an 18″ barrel capped with an AZ muzzle device.
– Another 28.1″ OAL variant with a mid-length handguard and an 18″ barrel, but this time with an A2 muzzle device.
– A more compact 21.6″ OAL model with what Brandon refers to as a Shon Plus length handguard and an 11.5″ barrel, also sporting an AZ muzzle device.
– The shortest in the lineup, a 20.1″ OAL with a base-length handguard and an A2 muzzle.

Senex Arms' MBLR-15

The MBLR-15 has a quick change barrel system and a quick detach handguard with MLOK slots. The rifle uses a Modified AR15 fire control pack utilization but a stock AR18 bolt.

On display were a couple of his Gen 2 prototypes, which suggests that Brandon is actively refining the model based on feedback and testing.

One notable aspect of the MBLR-15 is that while it is not a conversion kit for an existing AR15, it is compatible with a wide array of AR15 parts. These include:
– AR15 barrels
– Gas blocks
– Gas tubes
– Cam pin
– Firing pin
– Gas key
– Pistol grip
– Modified fire control system trigger
– Other minor parts

Brandon’s decision to incorporate these commonly available components could prove beneficial for end users, simplifying the process of customization and repairs.

Senex Arms' MBLR-15

Senex Arms’ MBLR-15

It’s always encouraging to see engineers like Brandon bring new designs, especially when they manage to integrate versatility with familiar parts, to the market.

It will be interesting to see how the market responds once Senex Arms secures the necessary backing and moves towards mass production of the MBLR-15.

TFB Staff
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2 of 19 comments
  • Mark Mark on Jan 24, 2024

    Very cool.

    Love me some Bullpup Master Race

  • Brandon Makowski Brandon Makowski on Jan 31, 2024

    Hello everyone, thank you for taking the time to check out the article! Its always an honor when TFB crew stops by. I'll be doing a product update video in the next few weeks to go over what is new with this model and next steps. Got to catch my breath from SHOT.

    Just wanted to touch on a few things, the MBLR-15 does indeed use a standard AR15 bolt and other bolt carrier components. This is a DI rifle however, been possible OEM upgrades and aftermarket support, the likelihood of it being piston is very high.

    As far as Glock magazine compatibility and pistol calibers in general, right now the focus is on solely on getting the rifle dialed in. Pistol calibers are definitely on the list and there are several avenues that could lead down. (mig1nc, I laughed way too hard at your comment on this. Glad to see you here my friend).

    The controls are all presently designed to be ambidextrous. The rifle will also end up with the ability to left hand eject. Modifying the bolt carrier shape for the Gen2 changed up the ejection port. Instead of spending time designing a new ejection port seal, I've decided it's best to simply optimize the standard right side ejection, simply mirror it over, and then design the seals. This is why the Gen2 prototype did not represent that capability. It will be there though.

    I do my best to answer emails and messages however, there are a lot and sometimes they get lost in the inbox. If you'd like to keep up to date on development directly from me, please join the mailing list on the website. There is also a blog on the website I've recently added as Facebook and Instagram have erroneously taken my last posts down.

    Once again, I appreciate you all taking the time to check out this great write up! Best wishes!