CETME-L Flats: HMG vs Prexis

You may recall a while back I picked up a CETME-L flat from Prexis, because it was the only option available for building a CETME-L rifle. Well, there is now another option available.

Hill & Mac Gunworks made a run of completed CETME-L rifles, and is also now offering builders’ kits, with barrels, weldment blocks, semauto and 922(r) conversion parts, receiver flats, and bending jigs, along with CETME-L parts kits – everything needed to build one of the guns (as of the time of this posting, flats and weldment blocks are available to order, with complete kits coming soon). I spent the last couple days building one with my friend and InRange TV co-host Karl, and we will be posting a series of tutorial videos to walk folks through the build process shortly.

However, before that publishes I thought it would be worth a quick post to point out the differences between the Prexis and HMG receiver flats. It is true that a handful of people have actually received flats from Prexis and managed to build them into working guns, but that is an excruciating process. The HMG flat and jig, on the other hand, actually work fantastically well. Let’s take a look at why…

(Note: All of the photos here use a Gen 1 Prexis flat, because those are the ones I have been able to get my hands on. The Gen 2 flat is reportedly better, but as far as I can see one would have to be crazy to actually pay money for a Prexis product)

Left: HMG Right: Prexis
Left: HMG; Right: Prexis
Left: HMG Right: Prexis
Left: HMG; Right: Prexis

 

Ejection ports - the Prexis ejection port is actually so undersized that a live rounds is too long to fit through it. The Eject a live round, one would have to drop the magazine and get it out through the magazine well.
Ejection ports (HMG on top, Prexis below) – the Prexis ejection port is actually so undersized that a live rounds is too long to fit through it. To eject a live round, one would have to drop the magazine and get it out through the magazine well.

 

Proxies left, HMG right. The Prexis locating hole is inside the receiver material, while HMG's is an extensions trimmer off after bending, which does not leave a hole in the finished product.
Proxies left, HMG right. The Prexis locating hole is inside the receiver material, while HMG’s is an extensions trimmer off after bending, which does not leave a hole in the finished product. Als0, note the significant difference in depth and definition of the reinforcing features.

 

This
The magazine well area really highlights the quality differences between the two flat (Prexis top, HMG below)

 

IMG_3321
Selector switch area. It is relevant to note that disassembly on the CETME-L involves the fire control group and safety moving a short distance forward and backward. The HMG flat allows this; the Prexis flat was made without an understanding of this feature, and that feature must be substantially modified to make a functioning gun.

 

Selector switch area from the other side (Prexis top, HMG bottom)
Selector switch area from the other side (Prexis top, HMG bottom). Also note that the HMG holes for the fire control group and buttstock pins are properly sized, where the Prexis holes and just locators that need to be drilled out.

 

IMG_3325
Magazine well and catch. The HMG flat has holes properly spaced for both the trigger pack pin and the magazine catch pin, as well as the proper full cutout for the magazine latch itself. The Prexis flat has a misquote magazine catch hole, not FCG pin hole, and an undersized mag catch pin hole.

 

Looking down the length of the Prexis flat. Compare this to the photo below...
Looking down the length of the Prexis flat. Compare this to the photo below…

 

Looking down the HMG flat. Notice how much crisper the stiffening features are.
Looking down the HMG flat. Notice how much crisper the stiffening features are, and how the bolt guide rails are straight, flat, and how it actually has a bolt hold open cutout. Also, the HMG flat is thicker than the Prexis, matching proper original specification for the CETME-L.

If you’ve been waiting to do a CETME-L build, now there is finally a usable flat available. If you have already gotten a barrel somewhere and are a skilled builder, the HMG flat and weldments will get you going. Otherwise, I would suggest waiting until HMG’s full builder’s kits are available, so you can get all the necessary components in one package. Having just finished building one myself, I know they are a good product.