Walli

What do you prefer and why? Aluminum (Material: 7075 T6 alu, surface coating: hard anodizing) would be lighter, but how many rounds would it take to see serious wear? (Barrel length would be 8"-10")

Wish we could have this kind of a match under IPSC rules ...

That was my understanding too. So it is no longer a "safe action trigger" but a "single action trigger" without a manual safety. Is that a good thing?

Are you sure it does not have anything to do with different bolt weights? When I compare my SI bolt and my Stern Defense bolt the difference in weight is quite substantial.

The Glock 17 Gen 5 MOS FS with a Forward Controls Design mounting plate is a really nice combination. You get the flexibility of the MOS, a mount that is designed the way it should have been from the factory and you do not have to modify the slide. Forward Controls Design Mounting Plate Review

It is my understanding that the HE509T does come with an adapter plate for RMR cut. The integrated mount of the HE509T is proprietary. Adapter for RMR

Yes, I do. I was luck that it did work with my Holosun 507c without any fitting. Many infos can be found in this thread: Better plate system for MOS

As good as it gets without milling the slide: Forward Controls Design

Which trigger springs do you have in your rifle? JP trigger springs

There is an interesting discussion about PCC with some JP shooters: Lessons Learned: PCC Nationals About 18 Min. they are talking about barrel length. I fully agree with them.

You have to look under JP AR Pistols: JP Pistol / SBR

If you are looking for cheap mount: UTG / Leapers I have this mount for the Docter sight and was really surprised how well this mount is made for the money. Newest mount: Trex-Arms Most adaptable mount: https://arisakadefense.com/collections/optic-mounts/products/offset-optic-mount Gold standard: JP

Is there a magazine adapter for Glock magazines that you would recommend?

Thanks for your kind offer. I was wondering whether Lead Star did a good job designing the magazine well, correct feeding angle and internal dimensions. I am aware that JP and QC 10 did a good job, there lowers just do not have the features and price I am looking for. I feeling more comfortable with Lead Star now.

Thank you very much for the responses. I get the feeling that there really is not much enthusiasm for the Lead Star lowers.