If we take the production of MG42s (the backbone of German infantry post 41), 17,915 were built in 1942, 116,725 in 1943, 211,806 in 1944, and 61,877 in 1945 (source: wikipedia! Too lazy to find a proper source at the moment). By mid 1943 terje has only produced 418 of these (I'm assuming the larger number are MG43s). This means he's only producing less ( 116,725 / 2 + 17,915 = 76, 277 * .7 [production to other fronts] = 53,394. 418 / 53394 = .00782) than 1% the historical amount. If 9927 is the MG42 production, then its .185919, or 19%. Either way he's severly underproducing, which may not be an armament shortage, but an OOB problem, as the number of machine guns in infantry divisions rose dramatically from 43 onwards to compensate for manpower shortages.
But those 418 aren't really machine-guns, they are MG-sections. The number doesn't include the organic machine-guns included in the infantry, panzer grenadier and pioneer sections, nor those fitted to AFVs.