Ok I have a S&W Eastfield 916 Shotgun 12 ga serial # B81433 I got for free because the fireing pin was boken. Now the Trigger assamble is cracking. When ordering the fireing Pin did see after markey tigger assambles for it should of order one then. Any ideals were I can by a good Trigger assemble?

The S&W 916's were never a well reputed pump gun when made 50 years ago, nor very desirable today. I checked Numrich Arms/ Gun Parts Corp lists a 916-A 12 gauge trigger plate assembly as in stock and available... for $225.
So while this part and the firing pin are available, in my opinion their replacement cost exceeds the value of the whole gun. I suspect that is why you were given the gun for free.

For the money you'd have to spend to fix your free 916, you could buy a used Mossberg 500 or other more reputable pump and have a way more functional pump gun than the 916.

That may not been the answer you were hoping for but is my pragmatic view. Welcome to the forum and good luck.

I have repaired two broken 916 firing pins. One was mine, another someone else's. Very easy to do if you have a lathe. It was originally Noble's design, S&W just took it over and gave it a different name. Disassembly is a little difficult. Never had a cracked trigger assembly, don't know exactly what that means. Actually not a bad design. I bought one used about 25 years ago and prettied it up a little. Sold it around six months ago for $200 because I have pretty much stopped hunting and clay bird shooting. Taught my grandchildren to use a shotgun with it.

I bought one in Tulsa a couple of years ago for $60.00. I got home and found out the firing pin was broken. Must be pretty common. A friend is a machinist/gunsmith and fixed it for $40.00. I sold it for exactly what I had in it to a guy who wanted a house gun. No more 916's for me.