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11/22/2017 10:05:29 PM
Posted: 10/19/2004 8:27:52 AM EST
[Last Edit: 10/19/2004 9:37:27 AM EST by itsallgood]
I am considering an SPR – tending toward a Mod 0 with the PRI rail
MSTN SPR 2d down from the top.
Any Concerns with the PRI Rail or any concerns with doing a Mod 0 vs. a Mod 1?
I hate to say it but I am tneding toward the Mod 1 based on aestetics, however, I do not want to compromise capability and am not wedded to the Mod 0.

Purpose is general shooting/plinking at +300 yards.

Thank you.
Link Posted: 10/19/2004 8:40:02 AM EST
A better answer can be given if you provide your functional reqs for this rifle.

Link Posted: 10/19/2004 10:13:08 AM EST
Link Posted: 10/19/2004 11:15:26 AM EST
I don't know if it's a concern for you, but the Mod 1 does have some flex to the forend.
Link Posted: 10/19/2004 12:29:05 PM EST
The word around here is that Mod0s aren't made anymore, just Mod1s. I checked my Mod1 clone and the rail does flex some. Does it affect how it shoots - not with the scope, which is mounted on the receiver - it may affect the BUIS, but they are just that BUIS, so you make the call whether it affects your needs or not.
Link Posted: 10/19/2004 1:03:05 PM EST
I went with both (obviously for price reasons, not at the same time). I think the big thing does come down to aesthetics and it is in what you would rather have. I like mine to be as "correct" as possible in terms of what the military is issuing/using, and if you are the same way, it may be easier for you to go with the Mod0 because parts are a little easier to find and it is a hair cheaper. The Mod1 is nice (I built it in 6.8 Rem SPC) but getting your hands on Knights parts is becoming a pain in the ass.
Either way, both are very accurate. With handloads through my Mod0 (topped with a Leupy 3.5-10 LR/T) I have been shooting groups on average 3/8" across and less. With the Mod1 (topped with a Leupy MR/T) I havent measured the groups but it also is amazingly accurate and I'll let you know how they measure the next time I get out.
Link Posted: 10/19/2004 1:42:08 PM EST
I think both will produce the accuracy that you are looking for. Personally I like the look of the Mod 0 better. I have all the parts for my Mod 0 minus the barrel. I'm currently using a Colt 20" as a temporary barrel. Yes the Mod 0 is heavier, but I like the fact that it's more stable. Or at least it feels that way. The only aestetic issue that I have with the Mod 0 is how stubby the standard 18" barrel looks with the Ops Inc suppressor collar all the way up against the PRI front sight. I like the little gap on the Mod 1. It looks a little sleaker.
Link Posted: 10/19/2004 2:16:57 PM EST
[Last Edit: 10/19/2004 2:53:08 PM EST by mongo001]
Figured I'd post a pic of my Mod1. Best I've done so far is 0.45" at 100 yds with handloaded 69gr SMKs and I'm subMOA with handloaded 77gr SMKs, just can't get them down below 1/2" yet, but I did shoot a sub 2" group (~1.9") at 200 yds with the 77grs once.


Link Posted: 10/19/2004 3:11:23 PM EST
[Last Edit: 10/19/2004 3:12:52 PM EST by itsallgood]
Thanks for the input. It seems odd that the Mod 0 weighs more with the composite tube. What sort of weight diff are we looking at?

By the way, I appreciate knowing that the aesthetics issue is considered relevant to others too.
Link Posted: 10/19/2004 3:22:09 PM EST
IIRC it's not the composite tube that adds all the weight, it's that big-ass steel nut holding it onto the receiver.
Link Posted: 10/19/2004 3:28:40 PM EST
[Last Edit: 10/19/2004 3:30:26 PM EST by mongo001]

Originally Posted By norman74:
IIRC it's not the composite tube that adds all the weight, it's that big-ass steel nut holding it onto the receiver.



That is a fact. The PRI middy tube I had was surprisingly heavy, but add up the big-ass barrel nut and the accessory rails and you have alot of steel there. Plus add the full length top rail (ARMS 38S-EX or something like that) to the whole Mod0 mix and your FF rail system is alot heavier than the Mod 1 KAC rail system by itself.

One advantage of the full top rail is an unlimited selection of scopes that can be mounted without eye relief problems. Mounting on the receiver rail only limits scopes to short eye relief styles like the MR/T, unless you want to bridge across the barrel nut. Knowing there is flex in the KAC rail system made me hesitant to do that, but many here have done it without issue.
Link Posted: 10/19/2004 3:35:03 PM EST
So what are thoughts on the PRI Rail vs. the arms 38S-EX?
Link Posted: 10/19/2004 3:50:08 PM EST

Originally Posted By itsallgood:
So what are thoughts on the PRI Rail vs. the arms 38S-EX?



No thought on that, as I have no experience with the PRI rail system. I had an M4gery with an ARMS 38S-EX-MOD and it allowed mounting of just about everything, but then along came the SIR and made the ARMS rail obsolete.
Link Posted: 10/19/2004 4:45:32 PM EST
When I bought mine I preferred Mod0, but the more I think about it the Mod1's advantages are too numerous to discount. The Mod1’s lighter weight and simplicity are certainly an advantage. Especially when it performs exactly the same. None of the differences has any effect on the weapons accuracy or reliability.
Link Posted: 10/19/2004 4:51:36 PM EST
Link Posted: 10/19/2004 4:58:45 PM EST
VA-
Are you referring to part count as a simplicity advantagesthe MOD 1 has over the MOD 0? Or other considerations?
Are there advantages to bipod mounting?
Link Posted: 10/19/2004 5:26:03 PM EST
[Last Edit: 10/19/2004 7:05:14 PM EST by Va_Dinger]

Originally Posted By itsallgood:
VA-
Are you referring to part count as a simplicity advantagesthe MOD 1 has over the MOD 0? Or other considerations?
Are there advantages to bipod mounting?



The Mod1 design is just pain simple. Using the KAC FF RAS over the PRI carbon fiber forend and ARMS #38 rail combo removes both weight and unneeded fasteners. You can also substitute the LaRue, DD, or any other FF rail system and affect nothing in the performance of the weapon. I really do not see any advantage/disadvantage to using the KAC or ARMS bipod mount. They both do there job very well and are ultra reliable. The KAC might save a little more weight, but that’s it.
Link Posted: 10/19/2004 5:36:59 PM EST
What he said too


Originally Posted By bigbore:

Originally Posted By Va_Dinger:
When I bought mine I preferred Mod0, but the more I think about it the Mod1's advantages are too numerous to discount. The Mod1’s lighter weight and simplicity are certainly an advantage. Especially when it performs exactly the same. None of the differences has any effect on the weapons accuracy or reliability.



What he said, but I still think the Mod0 looks cooler

Link Posted: 10/19/2004 6:18:28 PM EST
Both the mod 0 and 1, are in service. The mod 1 is a little lighter and the mod 0 has less flex out front via one continuous rail from front to back for perfect aignment. Both use the #40 rear folder BUIS, or the KAC 600 meter for the mod-1.
Good shootin, Jack
Link Posted: 10/19/2004 7:00:27 PM EST
I was thinking about getting the PRI forearm on my SPRbine. Two questions. First, is it possible to get one with an aluminum barrel nut rather than a steel one? Second, how big is the weight difference between a rifle length PRI and a KAC (or any other comprable rail system, LaRue, DD, etc.). I'm trying to find a rail system that's steady enough to handle a front sight but light enough where it won't add too much weight over my current setup (free float aluminum tube). Any suggestions?
Link Posted: 10/19/2004 7:42:33 PM EST

Originally Posted By caneau:
I was thinking about getting the PRI forearm on my SPRbine. Two questions. First, is it possible to get one with an aluminum barrel nut rather than a steel one? Second, how big is the weight difference between a rifle length PRI and a KAC (or any other comprable rail system, LaRue, DD, etc.). I'm trying to find a rail system that's steady enough to handle a front sight but light enough where it won't add too much weight over my current setup (free float aluminum tube). Any suggestions?



There is an aluminum barrel nut available for the PRI.
Link Posted: 10/19/2004 7:48:01 PM EST
Thanks.
Link Posted: 10/19/2004 9:14:50 PM EST
Link Posted: 10/20/2004 9:59:00 AM EST
I think comparably equipped the weight difference came out to like 12oz heavier for the Mod 0 version.
Link Posted: 10/20/2004 11:40:13 AM EST
According to my copy of the Black Rifle II the Mk12 Mod0 weights in at 11.7lbs while the Mod1 is 10.8lbs.

Link Posted: 10/20/2004 12:24:04 PM EST
PRI tube weights courtesy of PRI:

PRI rifle free float fore with all rails, steel nut 1.19Lbs (19.04 oz.)
PRI free float forearm with steel nut, no rails .855 lb. (13.68 oz.)
PRI rifle free float forearm with aluminum nut, no rails .700 lb. (11.20 oz.)
PRI rifle length, all rails and aluminum nut 1.015 lbs. (16.2 oz.)
PRI carbine length, all rails and steel nut .95 lbs (15.2 oz)
PRI Intermediate forearm with rails 1.010lb. Steel nut(16.2 oz.)
PRI Intermediate Forearm with Rails and High strength Aluminum nut .865lb. (13.8 oz.)
Link Posted: 10/20/2004 4:07:19 PM EST
MSTN built mine as a model O with the new PRI top rail instead of the ARMS 38. It shaved several ounces from the front end and did not comprmise the strength. It is not 100% authentic though. I believe a Wes had a pic of it in his delaer section on SPR's.
Link Posted: 10/20/2004 5:05:10 PM EST
Thank you M700Police. I could not find those anywhere on PRI's website. Looks like the rifle length with the aluminum isn't too bad at 16.2. Now if they could just do something about the price tag...
Link Posted: 10/20/2004 5:44:42 PM EST
ScooterP -

So yours is similiar to the MSTN Mod ) which I began this string with?MSTN 2d from top
How do you like it?
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