Just took this HK93 rifle home. Don't know much about it at, other than it shoots well (a couple magazines of XM193). From the pictures below can anyone help identify if there is anything special about it? Also - can anyone suggest a gunsmith/cerakote applicator that could help me restore the finish? It's my plan to replace some of the plastic parts and refinish the metal to bring it back to life. I would also like to consider changing the trigger housing out for a plastic model, maybe this would remove some of the rattle? Any suggestions to reduce the magazine rattle?