As some above I am a fan of back action side locks. Have a Frederick T Baker (sleeved) nitro proved 12 bore best quality gun (cased). I think Crudgington did a short bio. If you don't know Baker fought the "battle of the ejectors" with WR and won, though the legal costs sent him under. Mine is what I presume a wholly built piece after that matter. Pity he did not rebuild the business as the quality is something else!