Sadlak Nm gas piston with groove

Just curious if the Rem 700 and AR10 had fairly fast (1:10) twist? How does the twist rate of your Krieger compare?
R

Both my AR 10 and my Rem 700 were shooting less than stellar with 155's or 168's. I tried the 178's and they both started cutting cloverleafs. Best of all (joy of joy) they both like the same load. My m14 has the full treatment with both krieger barrel and 7.62mm gas cylinder and piston with a JAE stock.
 
Who has Sadlak pistons in Canada ? Brownells said no go to Canada ,not even a mag release . Fabsports said mayby 6 mounths :( . Where are you getting them from ??

Thanks
 
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