Some filing/diamond stone and some careful consideration of grease points seems to have it running for now. Some of it seems like pot metal, the main body looks to be aluminum (I can't confirm this). The fire control group has more parts than select fire firearms groups I've seen. They're all white metal as you called it.
I am happy that you got the M1 working again.
As far as lubrication is concerned I have been using different "CST" rated (thickness) of silicone oils on my BB guns pistils and rifles. There are some out in the Airgun world that claim that silicone oil should not be used on Airguns, I do not agree. For metals that come under great stress like engines, transmissions, drills, other mechanical devices etc. is true. However Airguns never reach the level of pressures that would ever come close to this kind of pressure. Secondly silicone oil will not decay the rubber/syntactic plastics on the gun seals, all petroleum oils WILL eventually degrade rubber/syntactic plastics.
I use a silicone oil rated 350 CST for the internal mechanical parts (trigger, slides, safeties etc.) and for all BBs I use a silicone of CST 100 that I run thru the guns. This is enough to lubricate the BBs and seals that the BBs go thru and the barrel. I just add a few squirts the container that I keep the BBs in to cover all of the BBs.
 
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Interesting this "white metal" you describe. I'm assuming we are not referencing Zamak, which is what a lot of people call "pot metal" Probably the best (worst?) example in firearms being High Point.
We often do not consider the quality of the materials themselves today. There are those of us that recall the Chinese steel of a couple decades ago.
Materials matter!
 
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I am happy that you got the M1 working again.
As far as lubrication is concerned I have been using different "CST" rated (thickness) of silicone oils on my BB guns pistils and rifles. There are sone out in the Airgun world that claim that silicone oil should not be used on Airguns, I do not agree. For metals that come under great stress like engines, transmissions, drills, other mechanical devices etc. is true, but Airguns never reach the level of pressures that would ever come close to this kind of pressure. Secondly silicone oil will not decay the rubber/syntactic plastics on the gun seals, all petroleum oils WILL eventually degrade rubber/syntactic plastics.
I use a silicone oil rater 350 CST for the internal mechanical parts (trigger, slides, safeties etc.) and for all BBs I use a silicone of CST 100 that I run thru the guns. This enough to lubricate the BBs and seals that the BBs go thru and the barrel. I just add a few squirts the container that I keep the BBs in to cover all of the BBs.
I have 1 petro based for linear movement and a ton of silicone everything for my fx guns. I got ahold of crosman and I'm going to send it in. According to the rep I talked to, I may have a fluke. The real bummer is they were closed Friday and I sat on hold for 3 hours on a system hiccup 😂
 
Materials do matter. Lubricants matter as well! Ofttimes cheapo China can deliver better service by using very high quality lubricants. My El Cheapo HPA pump being a good example. It's first 3-5 hours of run time were done with just OK quality semi synthetic compressor oil. That oil was replaced with Ingersoll-Rand full synthetic oil, I-R knows compressors, they double the warranty on IR pumps if you buy their IR synthetic oil. I also focus on dry and clean feed air for the pump, and use gallons not quarts of water to keep the temperature low. I try to keep the pump temperature below 70 centigrade. A big water reservoir is helpful. I just use the sink next to it fill it half full. So far so good. My last bottle of air filled faster, pump is breaking in.
 
I am happy that you got the M1 working again.
As far as lubrication is concerned I have been using different "CST" rated (thickness) of silicone oils on my BB guns pistils and rifles. There are sone out in the Airgun world that claim that silicone oil should not be used on Airguns, I do not agree. For metals that come under great stress like engines, transmissions, drills, other mechanical devices etc. is true, but Airguns never reach the level of pressures that would ever come close to this kind of pressure. Secondly silicone oil will not decay the rubber/syntactic plastics on the gun seals, all petroleum oils WILL eventually degrade rubber/syntactic plastics.
I use a silicone oil rater 350 CST for the internal mechanical parts (trigger, slides, safeties etc.) and for all BBs I use a silicone of CST 100 that I run thru the guns. This enough to lubricate the BBs and seals that the BBs go thru and the barrel. I just add a few squirts the container that I keep the BBs in to cover all of the BBs.
I tend to be the perpetual tuner and dial everything up. This one I wanted to just have fun and not chase something crazy like I have with my 22xx guns 13xx guns or my high end PCPs.. A smooth bore, bone stock bb shooter for fun sounded nice, and it's turned into more of a hassle than dialing up an fx impact. That's the real disappointment. I've got a crosman from the 70s that's been flawless my entire life and I got it from my dad who never did a thing to it since he bought it. I wish it had that sort of reliability.
 
I tend to be the perpetual tuner and dial everything up. This one I wanted to just have fun and not chase something crazy like I have with my 22xx guns 13xx guns or my high end PCPs.. A smooth bore, bone stock bb shooter for fun sounded nice, and it's turned into more of a hassle than dialing up an fx impact. That's the real disappointment. I've got a Crossman from the 70s that's been flawless my entire life and I got it from my dad who never did a thing to it since he bought it. I wish it had that sort of reliability.
Man do I hear you! I have the same sort of experience with Crossman BB Guna in my youth. All single pump or multiple pump compressed air guns. Very few Co2 BB guns. They were built stronger and better back then; without lawyers demanding to make cheaper parts, or move offshore, using cheaper labor so they could squeeze more profit out, Screw the item sustainability and quality, no profit there.
Anyway I also have a little fixer in my blood, more of an engineer/creator than a tuner... I suppose i just described a 'tuner". Oh well, Great to have a chance to have a chat with you sir!