Smoke from burnt caps leaves a lot of deposits in barrels, detonator chambers and Pins, breach area, magazine, bolt and slides which can be very corrosive unless cleaned thoroughly.
The same deposits make cleaning cartridges absolutely essential.
Dirt build up around the Detonator Pin and chamber causes jamming by failed extraction very quickly.
If the Mil spec CLP you're using now removes all that dirt then it must be pretty good.
I use regular Gun Oil made by Browning to clean and lubricate my metal models but also use White Vinegar / Bicarbonate of Soda / Hot Water to clean the parts with most dirt build up.
Soaking Barrels, Det. Chambers and Pins, cartridges in this solution cleans away most of the dirt especially if used in an Ultrasonic Cleaner.
Cotton Buds, rags and toothbrushes usually gets the last of it off.
Silicone Oils are recommended for plastic models
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.