Quoted:
Paperwork aside, I'm thinking of buying a reverse stretch MP5 pistol to turn into an SBR and I have a couple of questions since I've only shot an MP5 once and it was a MG I put exactly one magazine through.
How difficult is it to install a stock on it?
Any suggestions on stock type for a reverse stretch?
How difficult is it to mount a K style handguard on it?
What type of forend should I get?
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It's not. Pull a pin, slide off end cap, slide on stock, insert pin.
Reverse Stretch models (MP5K front end, MP5 rear end) use regular MP5 stocks, NOT MP5K stocks. Any stock that works on an MP5 will work on a Reverse Stretch model. Look for the big cap, rather than a flat plate, that slides over the rear of the receiver.
Reverse Stretch models use (mostly) standard MP5k front ends. They'll go right on, just like the stock. Remove pin, slide old handguard off, new handguard on, insert pin.
Whatever you want. The foregrip/finger guard combo is iconic and works well.