Quoted: I will use this rifle for home defense, tactical training, and for general plinking.
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This is the critical statement. Based on that you don't need a 20" barrel (especially and HBAR), so a carbine length barrel (16") is fine. If you plan on doing 'tactical training' at the schools you will want the lightest possible rifle. This eliminates the Dissapator with its HBAR (unless you can find some of the M4 profile Dissapators).
Going with a factory standard rifle I'd suggest the PostBan M4 Here is why:
1) Compact
2) Lightest of all your choices.
3) The 14.5" barrel is long enough to generate favorable terminal results with M193 out to 100 yards.
Here are my questions. What are the advantages/Disadvantages of the 16 in barrel versus the 20 in barrel? (velocity, accuracy etc)
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Accuracy isn't change, precision is (the 20" is a bit more precise) - but for your intended uses there is FUNCTIONALLY no difference.
Velocity is higher with the 20" and M193 fragmentation range is doubled. But again for the intended uses you really don't need this.
What are the advantages/disadvantages of a postban muzzle brake
Is the fixed telestock any good? Is it just a wannabe add on or is there an advantage to using it.
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The 'fixed' telestock isn't all bad. A bit longer than I prefer, but it saves you several ounces, and helps the rifle balance better. It also gives you an option on how you want to mount your sling (standard style or from the top of the stock ).
The standard stock is a bit stronger and has the storage area for your cleaning kit.
Another option is to get the Dissapator (same precision as the 20", but compact like the carbine). It has the fixed rear stock. Then do the following:
1) Replace the A2 rear stock (plastic part) with the A2 stock. This makes the rifle handle much better for the average person.
2) Send the Upper to Kurt's Kustom and have him turn down the HBAR barrel to a lightweight barrel. You don't loose any accuracy, just weight. You will appreciate this if you carry the rifle for long periods. (actually you can do this to any HBAR - 16" carbine or 20" rifle)