My first hand experience in the field and at my bench.
I’ve seen at least a dozen indian made stocks break in the field, from major to minor issues with the worst being a crack from the forward lock bolt down to the triggerguard. The issue was the bolt was too tight and the rammer engaged the bolt creating pressure. Most of the stocks that have broken were from Veteran Arms and Middlesex.
One barrel i looked over i did recommend to not shoot anymore. The owner came to me with a concern that the rammer head was catching something at the breach when cleaning. The breech plug was about three threads too short, patch was catching on the exposed threads. Fouling can build up in those threads and sometimes cause a ‘fuse’ like effect when loading, serious burns to the hand. Sent the barrel to Bobby Hoyt he welded additional steel to the breech plug.
I’ve worked on many locks from Veteran Arms and Middlesex. The internals on all of the locks needed a serious deburring and hardening. The locks are often have file marks that are polished over, causing parts to grind and leave whiteness marks. The problem with indian locks is the steel type used is not known, when i called the distributors they always said carbon steel. All parts i did a simple surface hardening including the frizzen The geometry of the locks is a different story, i often found the sear to be too big for the tumblers sear springs are placed too low.