So what were your overall thoughts?

Spec did you have any problem with the bolt catch and your lopro? Mine is hanging up and keeping the bolt from closing unless I hold the bolt release pressed to the upper. I am going to take a file to the back of the bolt catch a little bit and see if I can get it to clear.

I also realized after I got this lopro that my troy rail won't work with it. So I am going to have to figure out something else for hand guards. I will probably throw a set of carbine hand guards on it for now.


ETA: A very little Dremel work to the back of the bolt catch and it seems all is well.

Do you need to limit rapid fire or allow for cooling periods or anything with that o-ring adapter deal? What are the o-rings made of? It looks neat.

I'm considering some .22 goodness myself. This looks interesting.

Test: Spikes Dedicated Bolt Assy Converted With Their Chamber Adapter For Use In A Standard AR (.223/5.56) 1:12" Twist, 20" Barrel


I made it to the Range Last Night. Tried to get there late enough so it'd be cooler,,, NOT.
I didn't adjust the scope during these tests, I just used the setting "As Is", Where it was set for the Ciener Unit. That's why the hits are a little high.
The lower I was using had a Very Light Hammer Spring in it, the first round went bang. then nothing, nothing, nothing. I put the Ciener Conversion back in to verify it wasn't a problem with my Assembly of the Spikes Chamber Adapter on the Previously Dedicated Spike's Bolt. Same results with the Ciener. Changed the spring out, Put another Shoot-N-See Center up and began shooting.
I fired, resting on the bench at my established test rate trying to keep all things equil with previous sessions. This time I fired 200 rounds, the farthest hits didn't change with the last 50 rounds, So the Chamber Adapter that Tom sent from Spike's added to their Plated Bolt is actually more accurate than the best Ciener Conversion I have when fired in the same way, at the same rate.
The assembly functioned Flawlessly. The O-Rings make for a snug fit into the Upper Receiver. Meaning that you can remove the Upper without the Bolt Assy falling out. That's Nice in itself. Clean-Up was a breeze, the Plating really makes it easy. I'm not done testing yet, still a few Tricks Up My Sleeve.
SpecOps-13

MrMONEYman:
"So there is no noticeable difference in accuracy that the o-ringed chamber adapter makes, right?"


That's somewhat true. Here is what I found.
Their Plated Bolt is as accurate as the Best Ciener Conversion I have being fired at a slower rate than for these tests. I have 8 Cieners that were compared prior to my testing.


It will be very interesting to have your results added using M1S Parts. I'm doing my shooting by resting myself on the bench for some added stability. i load the mags to 25 and fire at a moderately fast rate to come up with an average accuracy. Same recover and shoot as I mentioned before. Not rapid fire and not slow fire. My own human error has something to do with that. I'm not as steady as I was 30 years ago, My eye sight isn't 20/15 now either.

We'll be able to relate your results better if you fire each time under similar conditions with each setup. Especially the rate of fire. You don't have to shoot exactly the same way or number of rounds as I do, just shoot the way you do each time. We can compare the 3 different rifles and get a pretty good idea of how well you'd be shooting mine and visa-versa. This will be a great way for us to compare the accuracy of Dedicated Spike's vs Dedicated M1S and the 1 in 9" and 1 in 12" . Very Cool.

The reason I shoot so many rounds for grouping is to get an average of My Ability, the Conversion/Rifle Capability and the Ammo's Consistancy. I'm using all Wal-Mart Federal Bulk for all the tests, but it'll be fine if you use something different. Doing all of this we should be able level your ability vs mine and get a good comparison of the Rifles and Conversions and the Dedicated Uppers.

Way Cool..................

SpecOps-13

I'm interested in seeing the results for this one.

I tried this with my MGI upper. I shot a M1S 1/9" barrel with conversion kit, then replaced the barrel with a dedicated setup. This kept the trigger and optics the same.

The result: The conversion kit and barrel shot 3/4" at 25yards, while the dedicated setup shot 1" groups. This was pretty consistent with several brands of ammo.

I need to repeat the tests at 50 yards to see if the different twist rate will have more impact at longer ranges.

Thats damn good shootin! You ready for that Lothar Walther barrel?

Here is a dedicated top using the Model 1 Sales bolt. It might not be a fair comparison, since the barrel is an Anschutz 19.5" match .22LR barrel. While the upper and lower receiver do come from Spikes, it is set to shoot with the aperture target sights. The bolt design does seem a little different than the one from Spikes, especially at the rear. Here is a close-up shot of the bolt




The test target shot at 50 yards with 50 rounds during some nice East Texas winds. Each square is 1".

When it comes to rimfiles, the most important things are the chamber, bore, crown, ammo, then bolt. The bolt deals with headspacing, firing pin location and resistance to recoil until the bullet has left the barrel. The way the chamber is cut and the overall quality of the rifling and bore diameter is way more important than the bolt itself. If it was not an issue, the Walther barrel would be considered the standard and not the premium option.