What to do with coupons?

I'm currently holding a bit over 60 coupons and plan on getting 90+, if not 100. At this point, there are only two guns I am really interested in attaining. I'd really like to get a special, permanent edition of the SG552 with coupons, however, I'm having doubts that Z8 will release anything of that sort. At the same time, I'm interested in getting the M4 gold (perhaps maybe the AK Gold instead), but after using all my coupons, I doubt I will buy ZP to get more. So, should I simply trade for a M4/AK once I reach 100 coupons, or should I just hang on to them in the hope of a special edition of the SG552?

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