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There has always been a debate on choosing a barrel that is
chrome-lined or not; some of these myths include barrel wear and accuracy. 
Chrome lined barrels are typically more expensive than non-chrome lined barrels
and depending on what type of shooting you are going to do, depends on what type
of barrel should be chosen. 

Chrome-lined
barrels provide better protection from barrel wear and erosion.  On top of that,
they are a hell of a lot easier to clean.  They offer better protection for rapid fire scenarios and will typically last longer than non-chrome
lined barrels.  However, they are less accurate than non-chrome lined barrels. 
This is due to the once sharp lands and groves that are covered by the lining. 
Taking in the consideration on barrel length, twist rate and bullet weight;
chrome lined barrels can see an accuracy drop of about 1/8” – 1/4” MOA @ 100
yards.  This may not seem like a lot, but again, this depends on the type of
shooting you are going to do.  Keeping in mind that for every 100 yards you go
out, your MOA will increase by 1”. 

YARDS

MOA

Accuracy Difference in MOA

100

1”

¼”

200

2”

½”

300

3”

¾”

400

4”

1”

500

5”

1 ¼”

600

6”

1 ½”

700

7”

1 ¾”

800

8”

2”

So by
taking the maximum ¼” MOA @ 100 yards, you could be off by 1” @ 400 yards.  Now
not saying a chrome lined barrel is or is not Sub-MOA, there are many factors
that play into the barrel itself.  The barrel could already be shooting ½” MOA
at 100 yards to begin with.  The chrome lining could be playing a factor in that
accuracy. 

This is
when I have to ask what is your preference in shooting?  If you are going to be
doing 20 mag dumps in 5 minutes, then the chrome lined barrel is what you want. 
For precision shooting or the 200 rounds a range day shooter, save the money
and get a non-chrome lined barrel.