Re: Thoughts on the H&K UMP
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CNC</div><div class="ubbcode-body">While not cheap, does anybody know if it's possible to just change to the UMP lower? The grip on those looks way more ergonomic. If it is possible, will it still use UMP magazines? I understand some milling on the upper needs to be done to accept USC magazines. </div></div>
Using the UMP lower IS THE CONVERSION (at least the "proper" conversion) unless you are talking about some of the older, hack-job, grease-gun mag conversions, etc., etc.
The conversion consists (primarily) of the UMP lower and stock block, plus the necessary 922r compliant parts (sear, trigger, mag kit, etc., etc.) given the "evil features" being added (pistol grip, etc.), and some milling work to the USC upper to open it up to accept the wider, double-stack UMP mags. That is very much an OVER-SIMPLIFICATION of the process, but that's it in a nutshell. If you want more detail, head over to HKPro and have a read through the mounds of detailed photos, vids (links to youtube) and other conversion-related information. HKParts.net/Adam Webber is a great source (among several) for conversion parts.