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6 ARC Upper Build: 18” PVA Osprey (Rifle +2”) + San Tan Tactical Billet Upper + SOLGW M89 Rail

Thanks for the suggestions Tony. It's definitely hard to troubleshoot something as complicated as AR gassing issues via a forum thread haha.

Josh at PVA responded to my email this morning and we are working through a solution. I'm likely going to send the barrel in for some slight tweaks or I can just try running it with a reduced power spring/LMOS.
That sounds like the best course of action. Be sure to keep us up to date.
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Delta Stryker 3.5-21x44 DLR-3

@406shootist
Thats a great vote of confidence for the Delta. Like I said in my OP ranges ill be hunting at are less than 400m

@koshkin
All things being equal would you recommend one of the other?

@BobKaare
I do little to no target shooting these days, very occassionally, and a Zeiss LRP is out of my price range.

I realise the 2 scopes Im looking at, originally 1, aren't really crossover scopes. I work in mrad and I like FFP.

I only really look at gear/optics when I need/want something new. I kind of stumbled on the Mk4HD. After a little bit of research, should I be worried about QC on the Mk4HD vs the Delta? Returning a Leupold for warranty out of the box would be a pita from Europe.
That's a tough call. For hunting in low light, I would lean toward the Mk4HD by a little bit. For overall use, I like the Delta a little more. I use clip-ons quite a bit, so the shorter Delta works better for my purposes.

ILya
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Gunsmithing What are you guys using now days to clean and lube?

I keep some Hoppes on the bench and it works good prior to leaving the range to pull through with an Otis cable with a patch of it to work on the bore, especially when warm. Plus it won't hurt anything finish wise, did that once with Boretech and from range to home, took some finish off an AI magazine. Use the Boretech at the bench otherwise.
Reference the Hoppes, I've ran a couple wet patches through a pistol bore, let it dwell 10-15 ins, hit it 10-12 passes with a bronze brush, wet patched it out with Hoppes, then ran a patch of oil through(Lucas or Clenzoil) and still got carbon out?