My experiences:
M1A/M14
G3
- For the purposes of this, we'll look at a Springfield Standard $1400 +/-
- Look long and hard for one with as many GI parts as you can find
- If a standard model will shoot better than 2" @ 100, be happy
- Replacement parts have went through the roof since 2002
- It isn't unusual to see complete bolts at or near $300
- It isn't unusual to see complete trigger groups at or near $200
- It isn't unusual to see GI gas cylinders at or near $200
- Rebarreling isn't something most can do on their own
- Haven't seen a complete GI parts kit in years for under $750
- Decent magazines are generally $25+
- Springfield production over the last few years seems of questionable quality, although their warranty is excellent (you generally get GI replacement parts)
DPMS/KAS/M110/Larue, etc.
- The only "clone" I would consider is the PTR $1050 +/-
- If a standard model will shoot better than 1.5" @ 100, be happy
- Completemilitary parts kits are anywhere from $150-$500 depending on manufacturer and/or country of origin
- Individual parts are availabile and relatively inexpensive
- HK produced aluminum magazines can be found for less than a $1
- Barrel replacement and/or headspace adjustment is generally possible for most with mechanical aptitude
- Hard to beat based on magazine and replacement parts availability and price
FAL
- For the purpose of this I'm using a AP4 DPMS for comparison $1200 +/-
- If it shoots over a 1.5" group @ 100, something is wrong
- Fire control group parts are all AR-15 common bits
- Take down pins, bolt catch retainer, buffer and spring are all unique
- Gas system parts are all AR-15 common bits
- Furniture with the exception of handguards/float tubes = AR-15
- Replacement bolts $150
- Replacement complete bolt carriers $275
- Rebarreling can be done by practically anyone
- For that matter - fitting the barrel extension, chambering the barrel and setting up the gas system could be performed by most anyone who paid attention in high school machine shop in the 80's or before.
- Magazines - $25+, some are of dubious quality.
- If and when the Magpuls are released, and working properly, this may be hard to beat for me.
AR-10
- For the purpose of this I'm using a DSA STG-58 $1250
- If it shoots under 2.0" @ 100 yards, be happy
- Complete parts kits are readily available, although getting more expensive $250+
- Rebarreling isn't that difficult, some special tools and parts required
- Magazines are available, but getting more expensive $15+
- Hard to beat if you like the ergonomics
- My experiences were poor, perhaps not fair to review it.