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Cross-Reference
In the PPS/SHS Shock Transfer System (STS) Review, we provided explanation to the purpose of a M4 gearbox bracer. In this article, we will compare the Modify Well Lock Bracer to the PPS/SHS Shock Transfer System.
The retail package for the Modify Well Lock Bracer is rather simple. It's in transparent plastic glued to cardboard (shown in the photo below).
The Modify Well Lock Bracer is practically the same as the PPS/SHS Shock Transfer System (STS) from the outside. It also has two 2mm hex screws to lock the impact pins (see photo below). However, it's the internals that differ as we will show later.
The side differs in the branding trademark and structure (see photo below). But the structure different should not make any difference in rigidity.
Looking at the other side of the two bracers, it seems the PPS/SHS STS has more metal (see photo below). The Modify Well Lock Bracer cut a corner in this area.
From the front, we can see one improvement of the Modify Well Lock Bracer. The Modify Well Lock Bracer's metal pins are much smoother and uniform than the PPS/SHS STS (see photo below).
There is very little difference between the two bracers when looking at them from the bottom (see photo below).
There are several differences in the APS M4 receiver that made the Modify Well Lock Bracer installation a bit different than standard installation.
First of all, the APS gearbox is typically a electric blowback (EBB) model. Therefore, the EBB plate strikes the STS. The solution I chose is to disable the EBB on the gearbox. (See "Disable Electronic Blowback on APS Airsoft Guns" thread).
Second, the APS M4 receiver magazine well has more metal and is more sturdy than the standard M4 receiver. Therefore, the magazine well actually blocks the hex screws (see photo below). The correct solution is probably to file out the receiver to reveal the hex screws.
I used a rotary tool with a metal circular file to drill out two half circle pattern in the lower receiver. The photo below shows the spots that had been filed on the lower receiver. With the holes filed, I was able to insert a 2mm hex wrench to tighten the Modify Well Lock Bracer.
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