I am looking at a used unit listed as "FLIR MilSight S135 Magnum Universal Night Sight (MUNS) AN/PVS-27 Magnum Universal Night Sight".  I would be running it primarily with my SR-15 LPR and an ACOG but, I also have an LMT MWS with a 4x16 Hensholdt which is what would get >200 yard duty (or feral hogs inside 200 yards).

These seem to be pretty good options that run $4K~$5K so, I'm curious of these older 3rd generation Green Phosphor tubes in them are still a good value today.  With modern premium PVS-14 options being >$4K, the price seems reasonable but I don't know much about this generation of NV tube.  My only other related NVG scope experience was a long time ago with both a 2nd and early 3rd generation PVS-4.

I am looking to complement my Trijicon IR-Hunter MK3-60mm with a clip-on solution for my semi-auto "day" rifle.  There are a lot of NV scopes out there but, knowing what the sweet spot is for build, price, etc. is tough.  The large PVS-27 option seems to have a definite advantage for gathering light in general and potentially offers an upgrade path in the future with a newer generation tube.  My primary target is dogs beyond 400 yards at night though, feral hogs won't be ignored either (most of my feral hog shots are 150~200 yards though).  Given a $4K~$5K budget, am I on the right track considering a used PVS-27?

I've had several, the tubes in them are typically VERY, VERY good.  I can see and resolve farther than I need to with the GP tube in mine so I see no point in trying to "fix" what isn't broken.  They are absolutely incredible devices, just husky.  As with any clip-on, make sure you measure your POI shift and record it.

From the YouTube videos I watched, they seem to have a very predictable and repeatable POI shift that would be easy to correct.

Thanks everyone for the feedback.  Yep, 4X magnification is definitely not the best for most applications.  On my longer range rifles though, the extra weight won't be as noticeable and higher power magnification scopes should work well with its superior resolution at long range.  I have a pair of Hensholdt scopes and an S&B on various long range rigs which will benefit from the PVS-27's performance occasionally and, being able to pinch hit with the SR-15 without pulling the ACOG is a bonus.  With the thermal, I should be somewhat familiar with the weight and handling characteristics with the PVS-27 mounted.

The ones I've had have been completely repeatable.  The 27 is the only reason I finally sold my last KN203 4ish years ago.  It was the only thing that actually outclassed the passive performance of the mighty SIMRAD.  It is the easy button for long range night shooting.  If you don't already have a weapon-mounted LRF, you should get one.