Metal Spring Guides?

[sAfuRos]

I'm planning on doing a semi-auto only "counter-sniper" set-up on my P90...so looking around at upgrade parts, i've run into ARS (AirsoftResearchSyndicate) quite a bit because of fanfare regarding their sorbopads. I'm planning on getting a Angel Silent Set so i don't really care, but ARS supposedly makes some good products.

They have http://www.airsoftresearchsyndicate....&product_id=85
Which is, to say, an aluminum hi spin spring guide.
I don't doubt that in terms of function that is probably fantastic. ARS is japanese made, great, and a thurst bearing combined with a rotary shaft is probably incredibly (as far as spring guides go)


Tl;dr
Most companies make polycarb spring guides excepting the base.
Should i avoid the ARS because it's aluminum? I'll be picking between ARS and a Prommy. Or maybe Angel, but i've heard those suck D:


Thanks

[Styrak]

Metal spring guides are fine.