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Nice job!
As for the recoil spring guide it just sits in there loosely, so there's a few options. I managed to use a WA and RS part, and Marui ones should work too (as long they aren't the full length variants).
Personally I kept the stock one, chopped off ~3-5mm from the tip and rounded it off with a dremel (grinder), sanded, polished; keeps the guide from breaking the recoil spring plug and bushing.
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