Dirty Bird Industries Mod D-5 9mm MP5-Style Billet Build Part: II " FIXED?!"

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BREAKING NEWS: THE DIRTY BIRD REPLACEMENT PART CAME IN, WE ARE GOING TO SEE IF IT WORKS!?
Magazine Catch Issues

Bad Magazine Catch measured 0.1480" thick

The Good Magazine Catch measured 0.1645" thick, which should be enough to hold the magazine in place in the magwell of the lower.

The bad magazine catch depth measured .0560"

The new and good magazine catch depth measured .0645"

That is a huge difference between the two parts, which is why the first part did not work at all.

Dirty Bird DB9 9mm MP5-Style Billet Lower Receiver

The DB9 MP5-Style Billet Lower Receiver is the perfect foundation for your 9mm AR build. Precision CNC-machined from 7075-T6 billet aluminum and finished with durable Mil-Spec Type III Class 2 hard-coat anodizing, this lower delivers exceptional strength and reliability.

Compatible with most MP5-style small-frame 9mm magazines, the magwell features a beveled feed lip for faster reloads. Each unit includes a pre-installed proprietary magazine catch and ejector, ensuring reliable mag retention and consistent drop-free performance.

Lower Parts Kit Compatibility: Any mil-spec or better LPK will work, but you won’t need the mag catch assembly, bolt catch roll pin, or the trigger guard, as those are all included with this lower.

Backed by Dirty Bird Industries’ Limited Lifetime Warranty

100% American Made

https://dirtybirdusa.com/products/dirty-bird-db9-9mm-mp5-style-billet-lower-receiver/

OR

https://www.midwestgunworks.com/page/mgwi/prod/g5lower?srsltid=AfmBOorEVi3lkRmGMvc9x4N8GyK4EGGcoZBXiuS6HWmBvh1bzGY8OWw3

Dirty Bird/ New Frontier Armory AR-9 / 45 Billet Upper Receiver w/ LRBHO

Description: New Frontier Armory AR-9 / 45 Billet Upper Receiver w/ LRBHO. This "Slick Side" upper receiver from New Frontier Armory is machine milled from aircraft grade 7075 T6 aluminum billets with hard-coat anodized matte black finishing. This upper receiver is designed for the AR-9 / AR-45 platform of firearms and compatible barrels, bolts, and calibers such as the 9mm, .40 S&W, .357 SIG, .45 ACP, & 10mm. This upper features the LRBHO (Last Round Bolt Hold Open) system that works great with lowers utilizing Glock mags and is also compatible with all standard and most aftermarket AR-15 / AR-9 components. Products from New Frontier Armory are machined and crafted in Las Vegas, USA and provides you with quality components to upgrade your favorite firearms.

https://www.midwestgunworks.com/page/mgwi/prod/pcupper

New Frontier Armory AR-9 Standard 9mm Bolt Carrier Group, Glock / Colt / MP5 Compatible
Code: BCG-9

Description: New Frontier Armory AR-9 Standard 9mm Bolt Carrier Group, Glock / Colt / MP5 Compatible. This 9mm bolt carrier group from New Frontier Armory is constructed from high grade 8620 steel with a magnesium phosphate black finish. This BCG is designed for the AR-9 platform of firearms and operates with the 9mm caliber. The bolt carrier group is precision milled for use with AR-9 lowers that use Glock, MP5, & Colt styled magazines. Products from New Frontier Armory are machined and crafted in Las Vegas, USA and provides you with quality components to upgrade your favorite firearms.

Features:
Weight: 14.3 oz.
Dimensions: 7.25" x 1.5" x 1"
US Made 8620 steel with mag phosphate finish
Ramped carrier to work with both 9mm and standard AR hammers
Precision milled for use with lower receivers that utilize Glock style, MP5 style or traditional Colt style magazines
Manufacturer: New Frontier Armory

https://www.midwestgunworks.com/page/mgwi/prod/bcg-9