I saw that Arc has Guarded sleeves for sale without the Arc6 just wondering, are they threaded for E-series? I really like the Guarded design.
I know the piston may present compatibility issues.
If by E-series you mean the SF lights, then, based on my samples, I'd have to say no. The threads on the head of my E1e are female, while the threads on the head of my Arc6 are male.
Thanks sounds like McG's PD series
I have both and prefer the non-guarded, mainly because I like small lights.