Perhaps you are thinking of experimental gun built by Greener to prove the merits of his patent cross bolt. The purpose of this gun was to demonstrate by supervised tests the merits of his patent cross bolt. The experiment is described in his book ,"Modern Shot Guns," pages 114-115. The only lockup on the action on the gun was by means of a detachable cross bolt. The gun was test fired with and without the cross bolt in place. The results achieved showed that without the cross bolt in place the gun gaped at the breech but did not fail.With the cross bolt in place there was no gape. The book contains illustrations of the gun and describes the method of testing for breech gape.
Last edited by Roy Hebbes; 08/15/13 07:33 AM.
