Robert Dean Ellsworth was convicted of robbery and first degree murder and sentenced to life imprisonment with the possibility of parole by a Nevada state court in 1988. He was paroled after serving 16 years. One year and one day after his release, he was arrested while in the possession of a loaded nine millimeter semiautomatic handgun. A subsequent search of his car and room uncovered additional ammunition and a shoulder holster for the weapon. Ellsworth pled guilty to being a felon in possession of a firearm in violation of 18 U.S.C. § 922(g)(1).
At the sentencing hearing and over Ells-worth’s objection, the district court applied a two-level offense enhancement in accordance with the advisory Sentencing Guidelines because the firearm he possessed was stolen. See U.S.S.G. § 2K2.1(b)(4) (2003). The government admitted that it could not prove Ellsworth knew that the gun was stolen, but according to the terms of this particular Guideline, knowledge is not necessary for this offense enhancement to apply. See id.; see also id. cmt. n. 19 (“The enhancement under subsection (b)(4) for a stolen firearm ... applies whether or not the defendant knew or had reason to believe that the firearm was stolen .... ”). The district court also increased Ells-worth’s criminal history score by two categories because the court found that the Guidelines’ criminal history calculation significantly underrepi'esented the seriousness of Ellsworth’s prior offenses. Accordingly, the district court imposed a 78-month sentence — roughly double the length the probation office had recommended in its presentence report but well within the 10-year statutory maximum for a § 922(g)(1) offense. See 18 U.S.C. § 924(a)(2).
Ellsworth appeals the two-level offense enhancement for the stolen gun, arguing that the absence of a scienter requirement for stolen weapons is unconstitutionally irrational given that knowledge is required for possession of stolen explosives. He also challenges the two-category increase *1149 in his criminal history score and the overall reasonableness of his sentence. We have jurisdiction under 28 U.S.C. § 1291, and we affirm.
I. Standard of Review
We review the constitutionality of a Sentencing Guideline de novo.
See United States v. Marcial-Santiago,
II. Knowledge that the Firearm Was Stolen
Ellsworth contends that the Sentencing Guidelines violate his Fifth Amendment right to equal protection by treating supposedly similarly situated felons differently without a rational basis. Specifically, the Guidelines impose a two-level sentencing enhancement for possession of a stolen firearm regardless of knowledge that the firearm was stolen, see U.S.S.G. § 2K2.1(b)(4) (2003), whereas the two-level enhancement for possession of stolen explosives applies only when “the defendant knew or had reason to believe” the explosives were stolen, see id. § 2K1.3(b)(2). Ellsworth argues that the relatively harsher treatment of felons in possession of stolen firearms is irrational because “stolen explosives ... are far more dangerous” than stolen firearms. We disagree, and hold that the Guidelines’ different scienter requirements for stolen firearms and stolen explosives are rationally related to a legitimate government interest and thus there is no equal protection violation.
Both before and after
United States v. Booker,
*1150
Under rational basis review, the distinction for sentencing purposes between felons in possession of stolen firearms and those in possession of stolen explosives “must be upheld against equal protection challenge if there is any
reasonably conceivable state of facts
that could provide a rational basis for the classification.”
FCC v. Beach Commc’ns,
Two other circuits have expressly noted the “great dangers” posed by ex-felons in possession of stolen firearms and reasoned that the absence of a scienter requirement in § 2K2.1(b)(4) “reflects this heightened danger.”
United States v. Schnell,
Further, a “legislature must be allowed leeway to approach a perceived problem incrementally” without violating the Equal Protection Clause.
Beach Communications,
Lastly, Ellsworth argues that the Sentencing Commission has failed to “bow to the specific directives of Congress” with respect to § 2K2.1(b)(4).
United States v. LaBonte,
Although superficially similar to the statutory offense in § 922(j), § 2K2.1(b)(4) is only a Guideline enhancement and not an independent basis for criminal liability. As applied to Ellsworth, the § 2K2.1(b)(4) enhancement increases the culpability of
felons
in possession of stolen firearms, a much smaller and distinct category of persons than the broad “any person” category covered by § 922(j). Because “Congress has called upon the Commission to exercise its judgment about which types of crimes and which types of criminals are to be considered similar for the purposes of sentencing,”
Mistretta v. United States,
Similarly, the absence of a requirement that a felon who possesses a stolen firearm know that the firearm is stolen is distinguishable from the situation in
Staples v. United States,
The district court did not err in applying the two-level stolen-weapon enhancement.
III. Underrepresented Criminal History Score and Reasonableness
Ellsworth next contends that the district court’s two category increase in his criminal history score violated his Sixth Amendment jury trial right,
see Taylor v. United States,
*1152
On appeal, Ellsworth argues for the first time that “the district court erred in increasing [his] criminal history category from III to V because no documentation was provided to prove up the priors pursuant to
Taylor
Accordingly, we must determine whether that increase in his criminal history score constituted plain error.
See
FED. R. CRIM. P. 52(b) (“A plain error that affects substantial rights may be considered even though it was not brought to the court’s attention.”) Because Ellsworth fails the first requirement of plain error review — “that there indeed be an ‘error,’ ”
United States v. Olano,
Ellsworth misapprehends the instances where the
Taylor
categorical and modified categorical approaches are applicable. We rely upon
Taylor
in the context of sentencing to determine whether a prior conviction fits within the scope of a generically defined crime, such as an “aggravated felony” or a “crime of violence.”
See, e.g., United States v. Rivera-Sanchez,
However, for the most part a criminal history calculation is not predicated on the commission of an underlying generically defined crime. Instead, the criminal history score looks to the defendant’s prior sentence of imprisonment, the length of that sentence, the defendant’s parole status and the length of time between his commission of the instant offense and his release from a previous term of imprisonment. See U.S.S.G. § 4A1.1 (2003). The Taylor problem does not arise when dealing with such criminal history facts because they are independent of the nature of the underlying offense. Only subsection (f) of § 4A1.1 could potentially raise a cognizable Taylor issue, because it refers to an underlying prior conviction for “a crime of violence.” However, the district court, in evaluating whether Ellsworth’s criminal history score was underrepresented due to exclusion of stale offenses, did not rely on § 4Al.l(f). Instead, the court looked to the other sub-sections of § 4A1.1 to determine what Ellsworth’s criminal history score would have been had his previous sentences not been too old to be considered under § 4A1.2(e). See swpra note 2. Therefore, the district court did not commit a Taylor error.
Next, Ellsworth argues that the district court violated his Fifth Amendment due process right when it relied upon what he calls the “unsubstantiated priors” in the presentence report.
However, Ellsworth conceded at the sentencing hearing that the presentence report listing his prior offenses was factually accurate. Accordingly, he has waived any challenge to the accuracy of the presentenee report.
See Olano,
We understand Ellsworth’s final criminal history argument to be a “challenge[ ] to the reasonableness of the overall sentence in light of all the 18 U.S.C. § 3553(a) factors.” Cantrell, 433 F.3d at *1153 1280. Ellsworth contends that the district court “unreasonably [gave] undue weight to the murder for which Mr. Ellsworth was already being punished in both the State and federal systems” and that, “except for his conviction in Nevada for first degree murder, ... his criminal history consisted of little more than misdemeanors with one prior felony burglary.... ” We conclude that the district court did not give undue weight to Ellsworth’s murder conviction and that it was reasonable for the district court to increase his criminal history score from a category III to a category V.
In
United States v. Menyweather,
The district court discussed at length “the nature and circumstances of the offense” and Ellsworth’s “history and characteristics.” 18 U.S.C. § 3553(a)(1). 3 It noted that Ellsworth, “this convicted murderer[, was] seated in the casino with a fully-loaded semiautomatic nine millimeter weapon which [had] recently been stolen from a law enforcement officer.” “[T]he presence of the holster [purchased by Ells-worth] and the loading of the weapon suggests that those were intentional acts by Mr. Ellsworth that were designed and intended to allow him to carry a loaded weapon ... on more than one occasion.”
Explaining its decision to consider what Ellsworth’s criminal history score would have been were his older convictions added in, the court reasoned that
[i]t is only because he was in the Nevada State Prison on a life sentence that these prior convictions became stale under the sentencing guidelines and time dated.... [Normally a defendant who is convicted of first degree murder and sentenced to a life sentence will ... seldom, if ever, have that conviction come back to be calculated again in a subsequent offense.
The court concluded that Ellsworth’s criminal history “closely resembles a V criminal history category as that is applied generally to criminal history V defendants.” In reaching that conclusion, the district court did not give undue weight to Ells-worth’s murder and robbery convictions, as Ellsworth suggests. The court was at least as concerned (if not more) about the nature of the instant offense and the length and seriousness of Ellsworth’s crim *1154 inal history as it was about the heinousness of the murder he had committed.
We also disagree with Ellsworth’s characterization of his criminal history before his murder and robbery convictions as not being particularly serious, or at least no more serious than that of the defendant in
United States v. Bad Marriage,
IV. Conclusion
The different scienter requirements of the sentencing enhancements for felons in possession of stolen firearms and stolen explosives are rationally related to a legitimate government interest and do not violate the Equal Protection Clause. There was no need for the district court to conduct an analysis under
Taylor v. United States,
AFFIRMED.
Notes
. The stolen firearm sentencing enhancement analyzed in
Goodell
had been codified as U.S.S.G. § 2K2.1(b)(2) (1990) (“If the firearm was stolen or had an altered or obliterated serial number, increase by 2 levels.”) — the enhancement was moved to § 2K2.1(b)(4) in 1991.
See Goodell,
. U.S.S.G. § 4A1.2(e) (2003) reads in relevant part as follows:
(e) Applicable Time Period
(1) Any prior sentence of imprisonment exceeding one year and one month that was imposed within fifteen years of the defendant's commencement of the instant offense is counted. Also count any prior sentence of imprisonment exceeding one year and one month, whenever imposed, that resulted in the defendant being incarcerated during any part of such fifteen-year period.
*1152 (2) Any other prior sentence that was imposed within ten years of the defendant's commencement of the instant offense is counted.
(3) Any prior sentence not within the time periods specified above is not counted....
. The sentencing court does not need to discuss explicitly all of the § 3553(a) factors.
See United States v. Mix,
