Thank you for pointing out the operational niche of the P90. It's excellent at what it was designed for. Just because it's not a flexible platform like the AR doesn't mean it's bad. 50 round magazine in a compact package. The 5.7 provides AP capability; it needs to be thought of as an upgrade over 9mm PDWs, not a downgrade from 5.56 SBRs. Yes it won't fragment like 5.56, but it won't have the sheer concussion and noise that a 10.5" AR would. It's already significant in a standard barrel configuration, now imagine that blast 8 inches closer to your face in a bullpup.
Thank you for pointing out the operational niche of the P90. It's excellent at what it was designed for. Just because it's not a flexible platform like the AR doesn't mean it's bad. 50 round magazine in a compact package. The 5.7 provides AP capability; it needs to be thought of as an upgrade over 9mm PDWs, not a downgrade from 5.56 SBRs. Yes it won't fragment like 5.56, but it won't have the sheer concussion and noise that a 10.5" AR would. It's already significant in a standard barrel configuration, now imagine that blast 8 inches closer to your face in a bullpup.