The McMillan stocks are quality stuff . I have guns in an A1 , A2 , And A5 . The stocks aren't drop in and will need bedded .

Stocks are a personal feel kind of thing and its probably best to try some out before you pick one because of the expense , The chassis system stocks all run in the 1k$ range and a A5 with no options is going to be 5 - 600 ish IIRC . There are other stock options out there that are available and deals on used stuff can be found pretty easily over on Snipers Hide .

The last stock SPS I dealt with was a buddy's gun and he put a good trigger on it and dropped it in an AICS chassis and it was a 1/2 - 3/4 MOA gun with handloads with no work to the barreled action .

The local precision rifle matches at PWSA and CRC are a good place to take a look at different stuff and talk to people about what works for them , there are threads on here about both matches in the competition section .