You have a couple of options. You can either use a delrin bolt sleeve or an aluminum sleeve. I believe some PL shockers came with slightly modified ones, but there was no major performance changes. You won't notice any gains by using either delrin or aluminum besides weight. Some people get a little crazy (like myself) and stick with the aluminum because delrin is a little more picky with temperature. The firing can, bolt, and bolt guide is where the real performance comes into play.
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i saw that some of the older sfts came with delrin bolt sleeves and the new nxts come with aluminum was there that big of a problem with the older delrin ones that they switched to aluminum or was it just a switch?
There have been aftermarket sleeves included with complete aftermarket bolt kits, but I don't believe that anyone has marketed a bolt sleeve as a stand alone upgrade.
you can drill holes bigger. It lets you drop OP, but you get less air eff.
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Freeflow once sold "aftermarket" bolt sleeves....but they didn't do anything. They were advertised as not having any benefit too. In fact they caused a few more problems if anything, since the FF manufacturing was not very good.
If you want lighter then delrin is the way to go. They're much easier to scratch than the aluminum ones though, so you must be careful. But I know you be careful anyway
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