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Posted: 12/5/2009 8:38:17 PM EDT
The following picture has the bolt faces of the Ciener on the left and Spikes on the right. If you look at the bottom of the bolt face where it strips the round from the mag, you'll see the Spikes has a chamfer while Ciener doesn't. Today I just saw a Tac Sol and theirs also doesn't have the chamfer.
My question is, do all the Spikes bolts have this chamfer? The reason I ask is because I think this is causing a lot of jams. It seems as though the rim of the next round in the mag does not always clear the chamfer area and the back of the round is held down while the front goes up the ramp and presto, jam. This happens to me when I hand cycle it and when I shoot it in semi and full auto. This doesn't happen with the Ciener kit which runs like a top after I wore out the firing pin and extractor and springs and replaced them with better ones from Blackdog Machine. I've used Blackdog 26 and 30 round mags and their new 50 round drum and all have the same results. Here is a picture of the jam. The ammo in the pic is CCI but I've also had the problem with other ammo. 
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My Spikes has the same bevel - no problems with functioning.
Checked Colt, DPMS, Ciener, USAF and 261 conversions - all do not have the bevel. The only .22 "conversion" that has a bevel is my CZ V22 and that one is beveled all the way to the bottom of the bolt face. Again no issues functioning. The only other thing I can think of is the extractor hook may be out of tolerance and may not allow the round to ride up the bolt face. .22 conversions are fun but they can be really, really frustrating. One of my AF units would not fire - not one single round would go off. Turned out the issue firing pin spring was so strong that even normal hammer springs could not set off the rounds. Replaced with a short bit of Lakeside recoil spring and haven't had one problem since. YMMV |
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AZ3GUNNER: All of the ones I have look the same as yours from the same viewing angle.
Possibly too strong of a recoil spring on the Spike's Bolt would be my next thought... The Ciener was well used and may have cycled fine. You say it does this being manually fed too...??????? That should eliminate the hammer spring being too strong. Will the recoil spring from the Ciener still work well enough to try on the Spike's Bolt? That would be a thought.. Good Luck, Spec |
| could be the spikes chamber adapter is tight or needs polishing so the nose of the 22 round will slide in without sticking. i had a few issues with mine until i polished adapter, lightened hammer spring, and bobbed hammer. worked great after that then bought a dedicated barrel and adapter for conversion and now it doesnt even poop in my face when i pull the trigger. |
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Come to think of it, I had a feed problem just like this a while back. The ramp was dirtier than crap when I looked at it.
It turned out to be a loose dedicated collar. It was pushing down slightly when the bullet hit it and I ended up with the bullet stuck almost exactly as your picture shows. Apparently the bullet bounced off the ramp and hit the chamber at a weird angle. Tighter dedicated collar fixed my problem... Just another thought. Spec |
| An easy comparison you can do yourself, is to put the Ciener bolt on the Spikes rail. If it still hangs up in the same way, its not the chamfer on the bolt that's causing the issue. Most likely the problem actually lies with the chamber or feed ramp not being smooth enough. |
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Quoted:
The only other thing I can think of is the extractor hook may be out of tolerance and may not allow the round to ride up the bolt face. The jam happens before it hits the extractor. Quoted:
Will the recoil spring from the Ciener still work well enough to try on the Spike's Bolt? I've tried swapping the spring and still have the same problem. Actually, the spring in the Spikes kit is shorter than the one in the Ciener. Maybe its still too long. Quoted:
could be the spikes chamber adapter is tight or needs polishing so the nose of the 22 round will slide in without sticking. i had a few issues with mine until i polished adapter, lightened hammer spring, and bobbed hammer. worked great after that then bought a dedicated barrel and adapter for conversion and now it doesnt even poop in my face when i pull the trigger. The chamber adapter comes out OK so I don't think it is too tight. I polished the ramp to a mirror finish and the kit was clean when it jams. It goes up the ramp OK but the rim gets cought on that bevel. I've installed the lightened spring kit that either came with the kit or I got it from Blackdog Machine. I tried the Spikes kit with a Ciener metal mag I have. The Ciener mag holds the round higher so the bolt grabs it OK. |
| have you polished inside the chamber wall where the nose of the bullet contacts on its way in. the angle is pretty steep. here is a link to the tuning part of spikes industry section. it is loaded with useful information. |
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Quoted:
have you polished inside the chamber wall where the nose of the bullet contacts on its way in. the angle is pretty steep. here is a link to the tuning part of spikes industry section. it is loaded with useful information. It jams before it reaches that point but yes I did polish that area. |
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Quoted:
Quoted:
have you polished inside the chamber wall where the nose of the bullet contacts on its way in. the angle is pretty steep. here is a link to the tuning part of spikes industry section. it is loaded with useful information. It jams before it reaches that point but yes I did polish that area. Is the firing pin sticking out? If you want to send it in we will take a look at it for you. |
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