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Posted: 9/2/2005 10:43:08 AM EDT
The shorter spring was the factory buffer spring in my Cav MKII. It has about 500 rounds through it. The recoil impulse seemed a bit sharp. I switched to the pictured ISMI spring and was surprised at the lack of compression displayed by the ISMI, but the lower felt recoil. I plan tol use the ISMI springs in all of my rifles. They seem to be a good way to lessen the stess placed on the bolt.
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Cool. Thanks for sharing that with us. If I remember the brand correctly, I have a few of those springs for my 1911. I haven't used one yet because I still haven't replaced the first one  but I have read some tests on the those springs and they hold up amazingly well compared to the stock spring. IIRC, the ISMI springs are chrome silicone which is the same type of spring I have in all of my AR mags. BTW, where did you get the recoil spring from? I would be interested in getting a few. |
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I ordered it direct from www.ismi-gunsprings.com. They dont have them listed on the website. They made a limited run for one of their distrbutors. Call and ask. They have some in inventory. I believe I paid about $22. I also bought a set of chrome silicone trigger/hammer spirings. Cant wait to give those a try. My initial and informal test supports the claim that these springs can handle more compression cycles than the standard music wire type springs. |
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This wasnt exactly "ASAP", but the old spring measures 10 1/16. The new spring measures 11 3/4 ''. I dropped in the ISMI hammer and trigger springs as well. The trigger pull went from too damn heavy to just about perfect (I dont have a scale). I havnt had any light hits with the new springs. |
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I've got a Brownell's CS spring, but no rounds through it yet. Buffer is a Colt "3" and Colt M16 BCG. I'll post a range report as soon as I get the barrel for this build in. The only significant difference taht I can see between it and the ISMI is that the ISMI is shot peened. How much were the ISMI FCG springs? Their website and my computer don't get along too well. -Cap'n |
Call ISMI. They had some CS buffer springs in stock. If not they will direct you to the vendor that sells them. The new springs are flat wire. They are supposed to be an improvement over the traditional round type. |
If that's the case, I'll be ordering one tomorrow. Thanks! |
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Let us know how the flat wire spring works. Mine is the round style. The owner at ISMI ("Mark" If I remember correctly) was very friendly and willing to answer a few of my questions. I used my factory buffer sping in a .45 acp upper for a few hundred rounds before I switched it to the current lower. I believe that is why it compressed so much. The FCG springs were $14 per set |
Would be interested to see the ISMI flat wound recoil springs action - I use them for recoil springs in my Glock (stock are flat wound in Glocks, ISMI are better!). |
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Instead of dropping the money on an H buffer, which I'm not yet sold on, I decided to order a flat wound ISMI recoil spring from DavidTubb.com. I called ISMI, but they said they only made them for Superior Shooting Systems aka DavidTubb.com. http://www.davidtubb.com/tcom_images/ar15_images/cs_buffer.html I called up the number on that page and ordered. $36.45 shipped. Ouch, but I use them in my Glocks and am sold. I wonder why ISMI doesn't sell them directly though. I asked the lady at David Tubb for the flat wound ISMI buffer spring and she had no idea what ISMI was. I told her it was the company that made their springs. Clueless. She also said the rifle and CAR springs were one & the same, that it is suppose to fit both. How is that? Wouldn't the already "extra-power" spring going to be even more so if stuffed into a CAR stock? Maybe I should stop the Kool-Aid drinkin'. 
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| Got the flat wire spring today. Only issue was it didn't want to fit over the step-up on the buffer so I had to expand it a little as I went to get it to seat on the buffer. The spring is about 1/3 rd. longer than the CAR spring. The flat wire ISMI spring is suppose to be "one size fits all" for CAR and RIFLE both. |
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