I've reflected on whether to contribute to an old thread, but decided i might as well - as people could alight here when searching for info! For large hands, I've had good success with the SPR type grips - even those cheaply available from e.g. 'army force' - looks and works superb on the SR25, and a similar grip about to be fitted to my SR15. The palm swell and thumb shelf are just so comfortable, and it has a very 'DMR' look about it. Only downsides being that SPR grips definitely can only be used right handed, and that the right side of the top of the grip extends high up the receiver and therefore will likely foul an ambidextrous safety. However, I actually managed to turn this latter point into a positive attribute for the SR25 - with a little modification with a dremel, the grip acts as a physical stop to the selector being moved past semi - thus being one of the two reversible methods that I have used to semi lock the SR25 for DMR use.