Be careful that you check the speed lock firing pin protrusion from the front of the bolt face.
I installed one a few weeks prior to an elk hunting trip
Had 3 misfires when I was shooting at my first elk in Co.
Click, chamber new shell, bang, click, chamber new shell, click chamber new shell, bang, dead elk. Elk ran about 50 yds. (I am sure first shot would have done it but the elk just stood there. 7mm 160 Accubond at about 75 yds out of a RUM into the vitals)
Didn't figure out the speedlock wasn't hitting the primer hard enough until under fire in the mountains.
Put the factory firing pin assembly back in and haven't had a misfire since.
(I may even have a REM700 LA speedlock for sale ...)