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Metal Finishes and Treatments: In order to understand the answers to the above questions, we must first understand what each finish or treatment is, and what it does.
In future articles, I will discuss melonite, manganese phosphate, and electroless nickel among others. For now, I want to cover heat treatment and anodizing. Case Hardening Case hardening is a process used with steels that have a low carbon content — that is, below 0.
The rest of the steel maintains its previous hardness. Anodizing is used on aluminum components — namely, the upper and lower receivers, as well as the receiver extension tube. Because anodizing does not offer much in the way of lubricity, the interior of each anodized component should have a baked-on dry film lube from the factory.
It does increase wear and abrasion resistance significantly — besides corrosion resistance, this is the primary reason for anodizing weapon components. Because exact shades are difficult to achieve, specifications for receivers will often call out a range of acceptable colors.
Receivers from the same manufacturer and the same lot might have visibly different shades of anodizing. Why Is Heat Treatment Important? So now that we have a very small understanding of each process, we can move on to their importance to the weapon system.
As mentioned previously, the barrel extension and bolt carrier are case hardened — but so are parts such as the fire control group. This case hardening is generally around ten thousandths of an inch 0.
In normal operation, with proper heat treatment, these components hardly ever wear out — generally, associated components wear out first, indirectly requiring the replacement of the unaffected components.
Vickers microhardness readings near the fillet region show that the bolt was not uniformly case hardened. Comparison of the microhardness readings near the fillet region and 10 mm from this region show a disparity of approximately units.
The softer, less carburized region near the fillet contributes to the formation of a wear area after firing just rounds. Well, for one thing, you can buy components from quality manufacturers that take the time to test and inspect — or require suppliers to certify that they inspect- each component individually.
However, if you depend on your rifle for more than just an afternoon of fun every month or so, it would behoove you to avoid cheap parts.
Proper heat treating and inspection procedures are often first on the chopping block when some manufacturers look for ways to save money. An improperly heat treated bolt may fail within a few hundred rounds by breaking at the cam pin, or it may lose a lug or two a few thousand rounds earlier than it would have otherwise.
The base metal,has a much softer base hardness. When people dremel away at the barrel extension, they are most certainly removing more than 12 thousandths of material. Improperly heat treated barrel extensions can and do fail. There are countless reports of cheap trigger jobs failing — this is mainly because the layer of surface hardening was removed and the soft metal underneath exposed.
These will fail — it may take 50 rounds, or — but they will fail sooner than properly heat treated and unmolested parts.
Anodized Receivers The upper and lower receiver, among other parts, are anodized.We provide in-house custom rifle manufacturing and repairs for ar15 barrels, bolt carrier group, & m4 rifles, as well as cerakote gun coating, special orders of non-AR platform firearms and training on the AR platform.
We're your one-stop shop for m4 accessories, lower parts kits, holsters & more. Barrel: Chrome Moly steel barrel chambered in NATO with a twist rate, M4 barrel extension, and a carbine-length gas system.
The barrel is finished off with a standard handguard, F-Marked gas sight base, and A2 flash hider. M4 compare the fitness test results to normative data and identify strengths and areas for improvement.
D2 analyse the fitness test results and provide recommendations for appropriate future activities or training. This assessment report will identify employee performance issues that can be resolved through training, propose a developed assessment plan to resolve performance issues and a projected costs and budget for the new assessment plan.
Training assessment is an important task for HR personnel. Use the Argosy University online library and textbooks to read about training assessments. regardbouddhiste.com By Wednesday, March 15, , deliver your assignment to the M4: Assignment 2 Dropbox.
Available Solution. $ This assessment report will identify employee performance issues that can be resolved through training, propose a developed assessment plan to resolve performance issues and a projected costs and budget for the new assessment plan.