Re: JLD Enterprise PTR-91?
Owned one for about 2 years. Put a couple thousand rounds down the pipe. I would say that it is a damn reliable battle rifle, but as db_17_85 said, I wouldn't expect to shoot tiny groups with it. It ate everything I ever threw at it including steel cased wolf and several varieties of mil surp. Not a single FTF or FTE, but again, couldnt really get better than MOA as far as accuracy.
The fit and finish was decent. Even coatings all around and smooth welds. The original plastics (stock and forend) felt pretty cheap though.
As for mods, there is quite a bit out there. I added a Magpul PRS2 (G3 version), Brugger & Thomet picatinny scope base, SWFA SS 3-9x, and a G3 wide forend modded to utilize a Harris Bipod. Most parts made for the HK-91/G3/CETME/MSG-90 will be compatible and drop-in. Mags are dirt cheap for it.
Parts can be found in abundance at DSArms, hkparts.net, and other specialty HK vendors.
If you plan to scope it, I highly recommend a buttstock with an adjustable comb as I could never get a proper cheekweld with the stock unit.
The worst thing about it for me was the trigger. I sent it out to Bill Springfield (
http://www.triggerwork.net/) and it was much improved.
Overall it was a fun rifle but I didn't find myself shooting it as much as I thought I would. Gotta love the "HK slap" to the forward charging handle though...