Bear in mind that the US military selected C158 in the 1960s and there have been other (and sometimes better) steel alloys developed since then. However, C158 isn’t the only steel alloy used to make bolts. For instance, some manufacturers use 9310 or 8620 steels to make bolts. For instance, it was extensively used in World War II for the M1 Garand rifle. For instance, adding a small amount of the element vanadium to steel (less than 1%) increases the strength, toughness and heat resistance of steel. 4340 and 4350 steels are also used by some barrel makers, but these steels are more difficult to heat treat properly and therefore the cost of the barrels increases. Besides the 4140 and 4150 steels that we looked at in the previous post, some other variants are also used for manufacturing barrels. In today’s post, we will continue to look at some more steel alloys used in parts of a modern firearm.

Another part that also receives a lot of force is the bolt of a firearm. While the barrel of a firearm has to resist large pressures, it is not the only part of the firearm that is subject to such large forces. Therefore, only large companies like Colt, Fabrique Nationale (FN), Daniel Defense etc. can afford to buy this steel. They also only sell this steel in large amounts and require the customer to buy a lot of it at a time. • When we stock new product offerings from our supply-partners, do we insist on reviewing the quantities and amounts after 60 days? Injection molded plastics are usually “foamed”, because the weight of a solid plastic stock would be excessive. Customers make many purchases and, as described above, FF finds it necessary to carry more stock to service those sales. The above mentioned 8620 steel is also used by manufacturers to make bolts for certain rifle models.

Actually, the original M16 rifles also used bolts made of 8620 steel, but the US military found that the bolts were wearing out after 40,000 – 50,000 shots, which is why they went with C158 steel for the bolt. Therefore, any AR15 or M16 bolts that claim to follow military specifications (or “mil-spec” for short) should be made of C158 steel as one of the requirements. In the case of the M16 family, the US military selected a steel called Carpenter 158 (also known as “C158” or “Car 158”) to be used for manufacturing the bolt. An alloy called 41V45 (which is basically a steel with similar elements of 4140 or 4150 steel, but with only 0.45 % carbon content and a little vanadium added) is often used with barrels made using the hammer forging method. By eating regular meals three times a day and including lots of fruits and vegetables you will actually increase your success rate to stop using the laxatives as well as to lose weight.

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