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Posted: 8/22/2011 6:40:57 PM EDT
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Are recoil springs interchangeable between Russian and Bulgarian on '74s? I've noticed that the AK-100 series recoil spring on my SGL-31 is a bit stiffer (i.e., has more spring coils) than comparable Bulgarian recoil springs.
Any reason why the Russians decided to do this? Any of you guys who own both Russian and Bulgarian '74s will notice what Im talking about. |
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Quoted:
Yes, the recoil springs are generally interchangeable, as for why the Russian has more coils than the Bulgarian (I've never bothered to count)...my best guess is different manufacturers and the Bulgarians didn't feel the extra coils were needed/ cut cost. Do you know if recoil springs are specific to caliber or not? I'm guessing this is the same recoil spring that came with my SGL31 http://www.k-var.com/shop/product.php?productid=17645&cat=0&page=1 What's also interesting is that the Russian recoil spring appears to be a brass color, whereas the Bulgarian looks silver––like stainless steel. |
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You may want to check the diameter of each of the wire used to make the springs. One spring may have thicker wire used in it's construction and have a higher compression rate with less coils than a spring made of a smaller diameter wire that has more coils to get the correct rate for the intended application.
You might be able to take a fishermen's scale and take the back half of the recoil assembly out and rig a piece of wire to the front half and a loop to hook the scale to the wire. Find a suitable backing plate for the rear of the spring and put a hole in it for the wire to pass thru and that should give you a generic way to test the spring rate by hooking everything up and pulling on the fish scale to tell you how much force was needed to compress the spring. Just make sure you try to compress each spring the same distance. That's about the only way to know for sure. |
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