
    UNITED STATES of America, Plaintiff-Appellee, v. Byron Keith THOMAS, Defendant-Appellant.
    No. 11-15896
    Non-Argument Calendar.
    United States Court of Appeals, Eleventh Circuit.
    April 16, 2012.
    Phillip Drew Dirosa, U.S. Attorney’s Office, Fort Lauderdale, FL, Harriett Galvin, Anne Ruth Schultz, Wifredo A. Ferrer, Kathleen Mary Salyer, U.S. Attorney’s Office, Miami, FL, Lauren E. Jorgensen, U.S. Attorney’s Office, West Palm Beach, FL, for Plaintiff-Appellee.
    Bernardo Lopez, Federal Public Defender’s Office, Fort Lauderdale, FL, Michael Caruso, Federal Public Defender, Federal Public Defender’s Office, Miami, FL, for Defendant-Appellant.
    Before CARNES, HULL and WILSON, Circuit Judges.
   PER CURIAM:

Byron Keith Thomas, a federal prisoner convicted of two crack cocaine offenses and a firearm offense, appeals the denial of his 18 U.S.C. § 3582(c)(2) motion for a sentence reduction. After review, we affirm.

Under § 3582(c)(2), a district court has the authority to modify a defendant’s term of imprisonment if the defendant’s sentence was “based on a sentencing range that has subsequently been lowered by the Sentencing Commission pursuant to 28 U.S.C. [§ ] 994(o).” 18 U.S.C. § 3582(c)(2); see also U.S.S'.G. § lB1.10(a)(l). However, if the retroactively applicable amehdment to the guidelines “reduee[d] a defendant’s base offense level, but does not alter the sentencing range upon which his or her sentence was based, § 3582(c)(2) does not authorize a reduction in sentence.” United States v. Moore, 541 F.3d 1323, 1330 (11th Cir.2008); see also U.S.S.G. § lB1.10(a)(2)(B).

A sentence reduction is not authorized if the amendment does not lower a defendant’s applicable guidelines range “because of the operation of another guideline or statutory provision.” U.S.S.G. § 1B1.10 cmt. n.l(A). Thus, when defendant’s applicable guidelines range is determined by his status as an armed career criminal, pursuant to U.S.S.G. § 4B1.4, and not by the amount of crack cocaine involved in his offense, pursuant to U.S.S.G. § 2Dl.l(c), the defendant is not eligible for §' 3582(c)(2) relief based on recent amendments to the base offense levels in § 2Dl.l(c) for crack cocaine offenses. See, e.g., United States v. Thomas, 545 F.3d 1300, 1301-02 (11th Cir.2008) (involving § 3582(c)(2) motion based on Amendment 706).

Here, the district court did not err in denying Thomas’s § 3582(c)(2) motion. Thomas’s motion was based on Amendment 750, which changed the drug quantity tables in U.S.S.G. § 2Dl.l(c) to conform to the Fair Sentencing Act of 2010. See U.S.S.G. app. C, amends. 750, 759 (making Amendment 750 retroactive); U.S.S.G. § lB1.10(c) (listing Amendment 750 as an amendment for which a defendant may file a § 3582(c)(2) motion). Because Thomas was designated an armed career criminal at his original sentencing, his offense level was based on U.S.S.G. § 4B1.4, not on the drug quantity tables in U.S.S.G. § 2Dl.l(c). See Thomas, 545 F.3d at 1301. Thus, Amendment 750 had no effect on Thomas’s ultimate sentencing range.

We find no merit to Thomas’s argument that he is eligible for § 3582(c)(2) relief because U.S.S.G. § 4B1.4’s armed career criminal enhancement applied only to his firearm conviction (Count 1) and not to his two crack cocaine convictions (Counts 2 and 3). At sentencing, the district court grouped all three counts for purposes of calculating Thomas’s offense level, pursuant to U.S.S.G. § 3D1.2(c). The court then determined that the applicable offense level was 34, pursuant to U.S.S.G. § 4B 1.4(b)(3)(A). Thus, Thomas’s offense level for all three counts was based on § 4B1.4(b)(3)(A), which was not changed by Amendment 750.

For these reasons, the district court correctly concluded that Thomas was ineligible for a § 3582(c)(2) sentence reduction.

AFFIRMED. 
      
      . "We review de novo a district court’s conelusions about the scope of its legal authority under 18 U.S.C. § 3582(c)(2).” United States v. James, 548 F.3d 983, 984 (11th Cir.2008).
     
      
      . Thomas involved a prior § 3582(c)(2) motion filed by the same defendant, Byron Keith Thomas, but brought pursuant to Amendment 706, a 2007 amendment that lowered the offense levels in U.S.S.G. § 2Dl.l(c) for crack cocaine offenses. In Thomas, we affirmed the district court’s denial of Thomas’s § 3582(c)(2) motion because Thomas was sentenced as an armed career criminal under U.S.S.G. § 4B1.4. 545 F.3d at 1301. Thomas concedes that our earlier Thomas opinion controls, but states that he brings his challenge to preserve it for possible future appeals.
     