Something from my side to Astr guys,
say, since you already have Indra rifle design in hand,
maybe try to make MP-7 equivalent from that in 5.56x30mm MINSAS and 5.7x28mm FN ? (probbly also in 9x19mm SMG variant just in case)
i mean, internally MP-7 is very much a reworked G-36 // SCAR-ish PDW thing,
during the prototype stage when it was just named H&K PDW they made this working prototype of test structure, downscaled from existing G-36 design, buttstock mostly sourced from MP-5 i assume,
in later versions they switched from self regulating gas piston system to flat tappet gas piston system without return spring, somewhat similar to what's there on SCAR
and current version of MP-7 bolt carrier is also quite similar to SCAR, just look at pics,
sidenote, i must say H&K guys did really nice job with trigger group of MP-7 i mean they were able to design a mini one and put it in a frame that takes minimal space inside receiver and easy to swap just in case, during disassembly one can pull it out and so,
design is also simple, it consists of just a hammer, it's two springs and buffer, the semi-automatic sear, the automatic sear, their two springs and two retaining pins, that hook-like part connects to trigger bar on frame etc, trigger must be progressive type with selector (i.e. on full auto setting, pull it slightly upto first break and it'll fire single shot, further pulling it would make it go full auto, on semi auto setting the length of pull//rotation could've been limited upto single-shot only)
so, maybe, try to make desi MP-7 equivalent here, using the design in hand ? just downscale it and it'll be done mostly
i know Astr guy have had some PDW design in mind but it was mostly limited to 9x19mm SMG-ish variant only, plus it appeared like inspired from B&T MP9-ish design in mind,
perhaps with their Indra design they could achieve more than a simple blowback operated SMG//Machine Pistol thing