Fn 9mm belt fed ar upper10/11/2023 You can see in the pic how small and thin the wire diameter of the nested springs are. <-this guy had a MGI spring failure as well. Here is a pic of an MGI unit disassembled. When the bolt slams home the buffer weights are then again allowed to compress the springs and eventually bottom out keeping bolt bounce in check as they would in a traditional buffer. Then when the buffer hits the back of the buffer tube the extended recoil bumped compresses the springs (softening the recoil) and also launches the weights forward which in theory also reduces the rearward recoil. When the buffer starts to move rearward the weights slowly slide forward compressing the springs and smoothing the recoil curve. The idea of the springs is to keep the tungsten weights at the back of the buffer and also keep the bumper extended. In my estimation the MGI OEM springs were pretty light for the duty they are asked to perform and ultimately died in a couple thousand rounds, resulting in the tungsten weights inside the buffer body locking up with little bits of broken spring bits. View QuoteThere are nested spring between the three traditional tungsten weights inside the buffer. I am tempted to go back and try another hydraulic setup, but mine runs about 800ish RPM and has good reliability so it just never moved to the top of the list to mess with. To be fair the MGI nested springs that go between the sliding weights disintigrated in a couple thousand rounds as well, but I replaced the springs with stronger spring and its been running for years ever since. I have a second NIB Colt hydraulic buffer but its just a conversation piece at this point. The Colt unit broke and spewed its guts and oil out after a couple belts. I even cut the buffers hydraulic piston down shorter and TIG welded the end plate back onto the piston so the compression was shorter and still had no luck. The kyshot I had reliability issue with a failure to strip rounds and short stroking. I tried one of the kynshot hydraulics as well as a colt hydraulic and didn't have success with either. I run mine with MGI Rate Reducing Buffer and a Sprinco "Red" enhanced spring. I don't shoot my Shrike on either Oly though and it lives in a custom magwell-less / SAW box only receiver I made and is paired up with one of the couple lighting links I have. The other Oly I have pretty much ever other upper fits without much issue but the Shrike was a no-go. One of the receivers made a trip through M60Joe and US Anodizing and now the Shrike fits that receiver. My Shrike would not fit on either of them initially. I have two Olympic receivers of similar vintage to the Oly/PAWs receivers.
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