need some parts for my new BAR10

Okay, so first offf I need a new what I think is a "Bolt Catch" or a "Piston Catch". It's what grabs the piston and pulls it back; now when you bring the Bolt back it just doesn't grab the Piston. Here's a pic:


And then what other parts will I need to add to my Cart to enable this gun to properly fire a BB at 500 FPS? I already got the spring.
And what would be a good TBB for this guy?
Links preferrably form ASGI or AEX

What is that you are pointing at....only thing I see is the sear(s)

Also why not just buy a reinforced sear set or a Zero Trigger?

Barrel I suggest..... http://www.airsoftgi.com/product_info.php?products_id=6169

That is the the part that catches on the piston and pulls it back when you cock the gun.
And links to a zero trigger and reenforced sear set would be Nicee

and nice link to the barrel by the way it looks nice

Piston Sear?....Yes!....No!....Yes!?....YES!!!

If im right(please gosh let me be right!)

I suggest this.... http://www.airsoftgi.com/product_info.php?products_id=5951

Ahhhh yes that looks right!!! Only man this gunna cost me a fortune!!

Really! Your that strapped for cash.....I woulda figured you for the job type...

I have a job but I'm already paying for a kwa m93r and a RS type 97b so yeah this was supposed to be a side project...it's already at $100 and I still need that Zero Trigger.

Z-trigs are over-rated. just buy some PDI piston and trigger sears.

I've got the Piston, so I just need a TBB, Piston Catch (What Merc linked me)
...and Trigger Sears?? What is this peculiar object you speak of

What it looksd like is all you need is the piston sear...my friend had the same problem you are having...it just wears out and you need a new one so buying a reinforced piston sear is your best bet...and TBB are epic...same friend bought one with his sear and its a Gravy Train!

the trigger sear is the thing the piston sear sits in.