The Barrel is a 24 inch heavy. The gun is a Tactical Rifles SVR.
That steel is a big one 3'X2' AR550, next to it is a 16" AR600 and next to that is a 12" AR550. The 3X2 footer is HEAVY, around 100lbs. But it still gives a great sound when hanging from chains. You are seeing almost the whole steel in that picture, only the ears the chains hook to are missing.
Here is the big steel at the top above the ears.
And here is the 16
And the Tactcial Rifles SVR Grendel Serial Number 001