Sorry for taking so long to get back to you on you question. I've been off the boards a lot lately and just noticed your question and PM. On your bent/breaking hammer pins on your WLA, it was a common occurrence on many due to the semi auto AR base conversion. What caused it on mine was the fact that the grip stick was positioned too high causing the hammer to sit too high putting a a lot of stress on the pins. That and WL welds a plate along the bottom of the carrier which smooths it, but adds to the hammer clearance issue. WLA made a lot of revisions during the run of M53's and addressed this as they progressed ( I assume). Mine was one of the first 25 made BTW. I'm not sure what they did so far as revision later on or with their new builds, but I would think they would have cleared it up by now.
I see Apex must have bought out some of the WL parts including semi grip sticks.
At any rate, Apex lists two types grip sticks as spare semi parts which are made by Wise lite:
"Short trigger box
" "These grip housings have a shorter (vertically) trigger box, and will sit higher in the machine gun."http://www.apexgunparts.com/mg42-m53/mg ... w-usa.html
"Tall trigger box" "These grip housings have a taller (vertically) trigger box, and will sit lower in the machine gun."http://www.apexgunparts.com/mg42-m53/mg ... -5625.html
If you don't already have one, I would try a "tall" grip stick assembly. which would place your hammer lower and perhaps relieve some of the pressure on the pins that keep breaking.
Alternatively you could do what I did, upgrade your AR hammer pins with with a set on KNS non-rotating pins which are made of much higher quality steel than average AR pins like these:http://www.brownells.com/rifle-parts/re ... 13801.aspx
Last but not least you could take some material off your hammer, placing more of a radius on it and remove some of the rear "tail" that slams down placing stress on the pins. After I reshaped my hammer, its tail and installed the KNS pins I never had any more trouble with breaking pins. I've done the same with 4 other M53 semi build with the others using BRP parts and have not had a pin break again.
Here is a pic of my modified hammer BTW. Note too that I removed a small amount off the top of the disconnector hook so the hammer doesn't slam into it as well.
Before (note the radius and tail and top of DC hook):
After my mods:
As a matter of related interest here is a pic of some of my semi modified bolt carriers. Far left was my first WLA, second is a WLA I got from Apex, 3rd is one I modified using a BRP kit and 4th is a BRP 2nd design. Note the flat bar WLA welds to the bottom of their B/C's. This helps to make them smoother, but again it adds to the hammer clearance issue. Which is why on the B/C I modified myself I cut a smooth shallow channel for the hammer to glide down, much like the BRP design with its own hammer channel. I've never had hammer pin breakage bending or hammer issues with the latter too.