Just installed a Maccari GRT spring and seal in my mod. 34 .177 cal.along with tar and moly (sparingly) and lost over 100fps. it went from an average of 830 fps. to 700 fps. Is this normal or did I not do something wrong?I expected to loose some speed but not this amount.The gun has no spring twang and is very smooth but....
Any ideas? Thanks Guys,
Gary
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