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unscrew the base end and make sure there isnt a "spare" thread protector cap in there...mine had one so I ended up with two...they left factory with it stored in there.
pretty sure the manders are...

interesting because the manders one that came on my JW15 is really good.....is yours a manders??? skinny black with rounded end...can push muzzle end washer inwards.....

gee I wish we could get it at $7 a packet here......
I remember stinger being advertised as having lower risk of ricochet......going so quick and so soft it breaks up rather than bounces.
funny how...