McMillan stock question?

STI_1911_Guy

Sergeant
Full Member
Minuteman
Feb 1, 2011
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Michigan
I am looking to get the McMillan a-4 stock for my rem 700 Sps varmint and have a question. They have them at midwayusa but in the description it says "semi inletted" but then in one of the reviews the guy was saying drop in fit was giving good accuracy. So what kind of fitting is needed by "semi inletted" ?
Thanks for any help.