I really like bayonets, always have. I had a DMPS lug and attached it to the barrel (they just bolt on). The bayonet is of my own creation. I took a M7 bayonet with a busted handel and a bent blade apart and a Kabar fighting knife with a shreaded butt plate apart (I was a hard on field knives in the service). Put the two togeather and there ya go.
I'm a ferm beleaver in the benefits of bayonets. They don't run out of bullets.
FSCJedi, I got RJM Talon from some Marine freinds of mine as a joke. In my younger military days I carried alot of edged tools (5 to 10 at any time). One notable blade was a handmade 2 1/2 foot machete with a ripsaw back edge that I always hand strapped to the outside of my pack. The Gunny and Staff SGT would tell the young Marines that I used it to saw off limbs to scare them. They figured out that I really used it for things like making tent poles, litter poles, stlints and other things.
As for shooting the PS90 with the bayonet on and it interfering with barrel harmonics question I don't know. I haven't tried yet. But in reality I'd probably only used it on Zombies. HAHA I mostly did it because like I said, I like edged weapons.