The ALG parts kit is sourced from verified suppliers who are contract suppliers to the US military for the M4 carbine. Also noted on the gold spring, i will bring it to our guys attention and see what we can do about that. It is a mil-spec kit, so procuring those NSN's only come a certain way, however i think we can source a black one and include it as an option. That is good feed back.

Give us a call at the shop, if youre having issues with your QMS we will happily get it resolved. Even though it is a mil-spec kit it should be very smooth that was the design intention. We also do not use a weak spring, we use a standard mil-spec trigger spring on the QMS, which is where the name is derived, Quality Mil-Spec (QMS). So if you need to push your trigger back forward manually, there is clearly an issue with your FCG and we should be able to get you fixed up. As for the rails, they are made from 6061-T6 aluminum, the same aluminum used by almost every hand guard manufacturer. Any manufacture that has QD's machined into 6061 will experience the same issue with wear and abrasion, especially when using a steel QD. When we make rails for the military we typically use steel QD inserts, however those inserts are very expensive and will inflate the cost of the rail well beyond what most people are willing to pay for, and most civilians are not using their sling to save their life and hang from a helo skid during a jump snafu. We have tested the QD slots to 800lbs free hanging without failure, and we felt that this was acceptable for the civilian market. if your rail has an issue with the QD not functioning properly we will be happy to take a look at that as well. Even though the rail was designed to be affordable, it shouldn't have any features that are not working properly. i have seen some cases in the past where the anti-rotation of the QD's was failing and the QD would free spin inside the QD slot, that is in fact a problem and we will replace the rail if that is something that is happening.